I don’t think that’s a fair thing to add on a Reddit-like site. You’re posting to a community stewarded by other people. It means people could post highly controversial and objectionable opinions and then just pre-emptively de-facto lock the thread, preventing others from engaging with it. It sort of has the same consequences as the block function on Reddit has now where you can just block the other account replying to you to force the last word.

Now in the event that Lemmy/Piefed incorporates profile posting, self-posting, then absolutely - that sort of screening makes sense.