They are still not adequately keeping track of the various buffs and discounts which can very quickly stack and result in absurdities like free cavalry if you own all the pastures or the supply mechanic being rendered moot by research and skill buffs. I'm pretty sure Zhuge Liang could not magically reduce the daily calory requirements of his soldiers, no matter what kind of genius strategist he was...o wait, that was actually the #1 reason why his northern expeditions went nowhere.
Why even have a supply mechanic when you can promptly switch it off completely? This is something even modern armies can't ignore.
Please, CA, try and pay attention to this, it has been plaguing far too many TW titles by now and it's one of the reasons why the difficulty curve can flatline so badly from mid to lategame, you're just stacking too much good things on top of each other too fast.