I don't like any change to the diplomatic system in general if we don't even have a current one that works.
That's my whole problem with the thread.
POI interactions with missions and diplomatic decisions doesn't work.
POI is a mess in general on the current patch.
Guarantee isn't being used to protect nations but to save them for later, oftentimes AFTER they've almost killed that nation. Any outside nation always has an easy target.
(can't fight Spain with all its allies? fight that tiny OPM that is being guaranteed by them!)
Alliances don't have any value. Using the OPM example again: Austria and Hungary could have same dynasty, 100 trust, 200 relations and an alliance from the start of the game until 1800, but because Austria wants to eat OPM Pommerania, which is allied to Hungary, it's going to war over said province and gets eaten by France 2 years later because it's out of allies all of a sudden. (Who would have thought)
The priority is 'mil acc > alliance > rm' but the order is 'alliance > rm > mil acc' leading to multiple nations starting the game with a stabhit unless the AI doesn't get those, as someone suggested. But at least they ruin relations and waste dip points for going over their limit. (who even comes up with this stuff?)
Alliances aren't being evaluated. If it's possible and an offer is being sent it will always get accepted. Salzburg is scared of Austria? We're in the same league as the Ottomans! Let's ally them! (alliance nets in general are a complete mess after league wars)
Wants your provinces triggers semi-randomly and the modifier goes up to -200, destroying a lot of stable alliances for no reason other than "I felt like it", turning lategame maps into 'everyone for themselves'
etc. etc. etc.
Really, who wants to make the system more complicated if the easy version doesn't even work?
It's like going to the supermarket and saying self-checkout sometimes takes 20 seconds extra so next time you want a steak you build a farm with your bare hands and raise some cows yourself to improve the situation.