I'm coming up against a relatively early baktria (2 provinces) who has what is as far as I can tell, infinite armies. I slaughter one every couple of turns and they show up with a fresh one with all the best troops they have access to a few turns later. I can't tip the balance of power in my favor no matter what.

That wouldn't even be so much of any issue except that only my armies can take attrition. So I have neutral parties putting their armies in my territory, starving ME out, but baktria can walk right through.

I'd ask at the very least to look at the supply system and not penalize the player for random neutral armies sitting in your territory.

I enjoy the attempt at realism, and I get why you chose not to make the AI adhere to it, but having non-hostile armies starving me out is both not fun and not what I'd call realism.