It would make the game extremely ridiculous and annoying, for one. Realistic movement only works if you're willing to add many more turns per year - otherwise you get situations like multiple enemy stacks coming from out of nowhere and besieging half your empire. Not to mention it give the possibility of taking half a faction's settlements in half a year, along with forcing you to fight every enemy stack for a thousand miles around if you ever want to take a settlement.
Plus, if you think the AI generals forming insta-armies by recruiting all the mercs in an area is annoying now, just wait until they have 6+ different merc pools they can empty and throw at you within the space of a couple turns.
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