Tbh the thing CA need to fix is AI. Yes a lot of these features would be nice, but the recurrent problem in TW is campaign AI. This is the reason that the AI get such ridiculous buffs; to balance their complete management incompetence. So this is the reason you stroll into a single province faction on normal difficulty and they have 3 max stacks that you can't even afford with your small empire.

I research with people who do game AI. Monte Carlo Tree Search, ANNs and such. They even develop AI for strategy games (namely star craft) and turn based games (chess and GO made the headlines in the past few years). Some work on "humanising" AI so that your opponents play well but don't feel inauthentic / cheesy.

CA, get in touch please, my colleagues would love another game to play around with.