The current Diplomatic Relations system is a big limiter in terms of effective diplomacy. There are a few core issues with it:
1. Static costs on any diplomatic relation, no matter how strong the relation itself
2. Multiple diplomatic relations with one country cost the same as a single diplomatic relation
3. Fixed costs on a per-tag basis rather than scaleable based on tag strength
Overall the Diplomatic Relations limit should be increased by a lot with different actions and with different tags taking up different numbers of Diplomatic Relations slots.
Regarding point (1) -- Static costs on any diplomatic relation, no matter how strong the relation itself
Military access costs the same currently as an alliance. By increasing the Diplomatic Relations limit, we can instead weight them different so that e.g. military access costs 1 relations slot yet an alliance costs more (with the cost possibly scaling based on who the alliance is with).
This is especially important for guarantees since we'd be able to use guarantees to keep nations in check. Right now guarantees are pretty worthless (and often gimp the AI such as the case with Mamluks and Cyprus or Ragusa and the Ottomans) since they take the same relations slots as alliances. Why guarantee a small nation threatened by a rival when you can just ally a major power and trounce the rival anyway?
My thoughts regarding costs for Diplo Relations slots:
1 -- Military Access, Fleet Access
2 -- Guarantee, Royal Marriage
3+ -- Alliances
The total number of current Diplo Relations should be multiplied fourfold. This would allow for the current 3 or 4 alliances that most Kingdoms have (with associated Royal Marriages) but increase the opportunity for more guarantees, military access that doesn't need to annoyingly be cycled on and off, and royal marriages that are more strategic to ensure non-hostility or increase chances of PUs.
(It would also be great if guarantees against nations threatened by rivals increased Power Projection too but that's another topic).
Regarding point (2) -- Multiple diplomatic relations with one country cost the same as a single diplomatic relation
This makes the PU game stale and makes every alliance into a super-buddy system wherein every diplomatic relation imaginable is stacked onto a single tag (usually the royal marriage and alliance stacked). There's limited ability to simply have a royal marriage and not an alliance (or vice versa) and often little reason not to. By making every type of diplomatic relation -- regardless of any others present with a country -- cost the same across the board it would make stronger diplomatic ties cost more and more but weaker diplomatic ties cost less.
Regarding point (3) -- Fixed costs on a per-tag basis rather than scaleable based on tag strength
Allying a powerful France or Ottomans is the same as allying a Free City. This is largely what leads to superblobs getting out of control and allying other superblobs to create mega-alliances. It also makes things like trade leagues and alliances of small nations pretty pointless. If diplomatic relations costs of alliances scaled with say, development, then nations would be more apt to create alliance webs of small nations -- and in fact, small nations would be able to band together against a larger threatening nation on their borders. Large nations would ally smaller nations of strategic interest and, conversely, smaller nations allying large nations to use them as their attack dogs wouldn't always be as effective as perhaps allying a host of nations that hate your intended target. Finally, things like the Franco-Ottoman alliance that pop up could be challenged by smaller alliances since great powers allying other great powers could cost 5, 6, or even more diplomatic relations slots and therefore be too much of a limitations to be worth it to maintain.
1. Static costs on any diplomatic relation, no matter how strong the relation itself
2. Multiple diplomatic relations with one country cost the same as a single diplomatic relation
3. Fixed costs on a per-tag basis rather than scaleable based on tag strength
Overall the Diplomatic Relations limit should be increased by a lot with different actions and with different tags taking up different numbers of Diplomatic Relations slots.
Regarding point (1) -- Static costs on any diplomatic relation, no matter how strong the relation itself
Military access costs the same currently as an alliance. By increasing the Diplomatic Relations limit, we can instead weight them different so that e.g. military access costs 1 relations slot yet an alliance costs more (with the cost possibly scaling based on who the alliance is with).
This is especially important for guarantees since we'd be able to use guarantees to keep nations in check. Right now guarantees are pretty worthless (and often gimp the AI such as the case with Mamluks and Cyprus or Ragusa and the Ottomans) since they take the same relations slots as alliances. Why guarantee a small nation threatened by a rival when you can just ally a major power and trounce the rival anyway?
My thoughts regarding costs for Diplo Relations slots:
1 -- Military Access, Fleet Access
2 -- Guarantee, Royal Marriage
3+ -- Alliances
The total number of current Diplo Relations should be multiplied fourfold. This would allow for the current 3 or 4 alliances that most Kingdoms have (with associated Royal Marriages) but increase the opportunity for more guarantees, military access that doesn't need to annoyingly be cycled on and off, and royal marriages that are more strategic to ensure non-hostility or increase chances of PUs.
(It would also be great if guarantees against nations threatened by rivals increased Power Projection too but that's another topic).
Regarding point (2) -- Multiple diplomatic relations with one country cost the same as a single diplomatic relation
This makes the PU game stale and makes every alliance into a super-buddy system wherein every diplomatic relation imaginable is stacked onto a single tag (usually the royal marriage and alliance stacked). There's limited ability to simply have a royal marriage and not an alliance (or vice versa) and often little reason not to. By making every type of diplomatic relation -- regardless of any others present with a country -- cost the same across the board it would make stronger diplomatic ties cost more and more but weaker diplomatic ties cost less.
Regarding point (3) -- Fixed costs on a per-tag basis rather than scaleable based on tag strength
Allying a powerful France or Ottomans is the same as allying a Free City. This is largely what leads to superblobs getting out of control and allying other superblobs to create mega-alliances. It also makes things like trade leagues and alliances of small nations pretty pointless. If diplomatic relations costs of alliances scaled with say, development, then nations would be more apt to create alliance webs of small nations -- and in fact, small nations would be able to band together against a larger threatening nation on their borders. Large nations would ally smaller nations of strategic interest and, conversely, smaller nations allying large nations to use them as their attack dogs wouldn't always be as effective as perhaps allying a host of nations that hate your intended target. Finally, things like the Franco-Ottoman alliance that pop up could be challenged by smaller alliances since great powers allying other great powers could cost 5, 6, or even more diplomatic relations slots and therefore be too much of a limitations to be worth it to maintain.
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