Because there's currently no meaningful downside to going with 100% Tier 6 units in your army. If you manage all the training, there should definitely be a payoff - but the only downside (higher wages) is meaningless in most cases. I'm not saying this has to change by the way.
Feature complete? Can i get trait please? Some perks that work? Maybe a handful of 5 minute repetative quest. Im tired of seeing the same five lines of dialog. Pretty sure ive rescued the locals duaghter 100 times. She refuses to stop running away. As far as i can see ONE feature is complete. Combat.
And lots of people here forget (or weren't there when) we have been promised a near complete EA. Fanboys don't seem to understand the source of the negative feedback. They still carry the same tune nevertheless, "It's EA! ehehehehe". Thank you, we know.
Sturgians are Kievan Rus, not Scandinavians. The Druzhinik are fine.
And absolutely do not touch the brigand/horse raider branch. They are unique, fun to use, and one of the few strengths of the Sturgian troop lines.
Aserai are not Arab-based, they're North African-based. Their troops are fine.
It seems like you think there's a problem with having a lot of noble lines being heavy cavalry and are trying to shoehorn a solution to it. I don't think there's a problem at all and your proposed solutions would actually create one.
1. is shown
2. can be seen a the central town.
3. would be the most direct path.
4. yes should be implemented.