I get that it wouldn't be nearly as much of a problem it is in Skyrim (and holy hell is it a problem in Skyrim), but it would still be a problem as you don't always know what an NPC is gonna do, and I'm assuming that you will eventually get spells/abilities that take more than one turn to power up/charge (ie. your individual character's unique/special move).

I was once doing a dungeon in Skyrim and had a follower. Follower gets killed because he runs right in front of me while I'm fighting (as in, he pushes the enemy out of the way to stand in front of me). I ressed him with console commands but he left my service, so I reloaded only to find I hadn't saved since the beginning of that entire section. Needless to say my follower got a second helping from my mace.