But you did not have limited savegames in the first place. You can save as much as you want… on the strategic map. Even without the ability to save inside of combat it will not hurt you that much. Fights don´t last that long. If you don´t have the time to play half an hour without running away from your pc you will hardly find any game that works for you. This is not the game´s fault but your inablility to manage your time properly.
Yes a save on exit would be nice in case you have to go, but if implementing this would mean leaving out more important features it would be a bad trade.
"I am a Paladin!"
>OMG, Malthus, there are no damn paladins in Battle Brothers...<
"OK, OK! Then I´m a wrecked down minstrel drunkard pretending to be a paladin, singing so wrong in the midst of battle that even the undead run in fear... Better?!"