Immersiveness, yes. Playability, terrible. The in-game characters don’t follow real-world physics, so adding one feature from realism would break the consistency of moving like a game toon.

Yes, they’re stupid, but you still need to get them into a very poor position and then leave them to their own devices if you lose many of them. I haven’t lose any thralls in recent months, and I’ve taken them to fight everything the game has, except the new Purge. Yes, even in the middle of a Siptah Maelstrom. It’s great fun, and good training for the thralls.

You do need to help them fight, though. Otherwise yes, two skeletons can stunlock the thrall so he won’t ever have a chance to fight back because even when he’s not being hit, he still takes several seconds before he decides to start attacking back. This is apparently especially bad on crowded servers, because the thralls need the server’s processing power to make decisions, and if the server is at its limit, the thralls can become quite unresponsive. So it’s more a crappy server problem than a game problem.