Shoshana Kessock has an interesting article on the growing trend in overseas larps of mandatory debriefs, and why it sucks:
TL;DR: Pretty obviously, not everyone wants to talk about their feels, even after an intense game. Forcing them to stay in a room and say something publicly can itself be an unpleasant experience. There’s also questions about what the mandatory debriefs are for - whether its really for “emotional safety”, or so organisers can see if their larp produced the expected emotional effects and get some feedback (or worse: subtly criticise players who “did it wrong” and felt the “wrong” things). While GMs running intense games should care about emotional safety, having a range of options and recognising that not everybody wants to talk (or not everybody wants to talk to them) is probably better.