I hate to say it again but sounds to me like another game mechanic Larian thought was cool without really thinking about how to properly implement it
That... May be a bit of a hasty judgement?
I mean, chances are they are simply still working on it.
On a related note, "long rest" or not, I think the player should be able to "wake up" knocked out characters once the combat is finished with the "Help" command.
And they obviously shouldn't stay "aggro" unless it makes sense in context that they do (i.e. monsters).
Different argument for being pissed at you. That's perfectly reasonable.
