Please saty on topics Gents
Thanks.
The AI usually recruit units everywhere and then, gather them into a stack before to launch its attack. If we disband the units too early, that stack will never be. If disband too late, it might cause other troubles such as settlement rebellion or left undefended at the worst moment, etc...
Beside and as already mentioned, I fear that the player will loose control of some of his army management, by recruiting them and loosing them with that script. I'm really not convinced it would be good for the gameplay
Beside, how will this feature work for factions with a different system? For example, ERE had a more professional army. Cumans had a tribal system. I've to check but I think that the Russian factions had also a system slightly different and I haven't talked yet for Lithuania.
There are too many parameters to be taken into consideration and a lot of testing would have to be done. That's definitively something that the team can't afford for now imo.