My objection has never been about the existence of a particular result. I am not saying anything in particular is badwrongfun. Generally, if everyone is aware, sure, that's fine.
But... (there's always a but)...
Specific situation beats general, and real people are more important than "setting logic". So, as a random example, if Player C's Dad died last week, and you TPK them... well. you own that, and claiming any upset is the player's fault for choosing to play that week shows a remarkable lack of empathy on the GM's part.