The wrong premise I'm talking about is that more troops of certain kind increases the odds of using certain tactics.
Here is what I did: I put one retinue of 400LC/100HC with 10000 HI. The odds of landing harass tactic was 45.7%. and shieldwall was only 40%. Does that seem right 400 LC vs 10000 HI? Well I added another LC retinue and the odds were still 45.7%. With only HI there is no harass tactic and shieldwall is 75%.
Thank you for testing this. This implies that availability of a troop type affects if a tactic is available but its numbers don't affect how often it is used. (Aside: the percentages are not uniform across generals and fights, so there is SOMETHING affecting them). This was arguably OK when everybody was just wandering around with levies (because it was very hard to significantly impact army compositions), but is very much not OK with retinues (or put another way, I don't want 5000 archers doing diddly squat because i've also put in 400 LC and the general goes 'lets do harrass! herp derp'). This smells like good idea, badly implemented.
Valinn's comment that the very large penalties on some tactics isn't a great design choice is also a valid point.
The game also has an amazing knack of providing lots of feedback, but not enough useful feedback, so for example we get told the bonuses and penalties to our units, but not their base stats (thats in a game file), so we can't parse together what it all means.
Levies are a mess but I think it's fine and probably more realistic than single unit type retinue flanks. Unupgraded Castle has LC in it and you will end up with a mix anyway so adding more of unit X shouldn't screw you. So you shouldn't worry because you are already screwed.
NO. Contrary to how the game presents it, but medieval generals didn't just jumble their units together and pick a tactic at random (they could be uncreative and make bad decisions but that isn't jumble and pick). They were limited by the troops they had available, and the skills of those troops, but they weren't going to pick tactics relying on lots of light cavalry or archers if they had very few. And separating out infantry/cavalry and giving them roles was the basic that every general did (well tried, in some circumstances it was done for them, but even that was reversion to customary (or plain bad) tactics, not French fighting like Turks or Mongols because of dice rolls).
Raid has a trigger of 0.2 which is high. Most tactics have 0.01. I wonder if that means 20% and 1% of units in a flank?
It would mean this isn't accurate "It seems the amount doesn't matter at all as long as you have at least some." for raid tactic because 20% is more than just some
Yes, they would be percentages, but 1% of a flank is a really, really small no (eg to remove that 1% tactic as an option for your 400LC retinue, the flank would be need to 40,000+ (which equals attrition in almost all cases)