10 Additions We'd Like To See In Total War: Three Kingdoms

Vassalization is a major aspect of the diplomacy of the game. As your realm grows in size, your corruption levels will skyrocket. By the time you own a quarter of the map you're looking at upwards of 70% corruption. Of course each point of corruption is 1% of your income gone.

The game, then, wants you to vassalize other factions to alleviate this factor. You get 20% of your vassals' income as tribute. So if you can give two commanderies to a vassal and lower your corruption by 10%, and the vassal is small enough to have 0% corruption, then in theory you've just raised your income significantly. After all, if the income produced is 1000 and you've got 70% corruption, you're only getting 300 from there. Give it to a vassal and he'll give you 200, plus your entire remaining realm will get +10% income by lowering your total corruption. It's a good plan.

Except for one thing: There's no one to vassalize by the time corruption becomes a real issue! Several playable factions start off too low-rank to acquire vassals until the mid-point of the game, and by then you've conquered most of the smaller factions. The ability to convert a commandery's administrator to a vassal would be a great feature. You'd have to deal with the fact of losing one of your officers, maybe even have it cost a few thousand in wealth to 'fund them with retainer'. So worth it, though.