I realise this could have its problems with abusive mods (although Lemmy records when people edit posts), but to me, it has a lot of benefits. Some communities have rules around how posts should look for clarity and/or aesthetic purposes. Sometimes as a mod I see posts that I think are fine, but could just be slightly adjusted to look a bit different or match up with the standards of the community - and I don’t want to be anal and remove it over something small like that - but I would quietly edit it.
I think if the edit log showing the moderator that edited it, and timestamped was publicly visible then any attempts at vandalism or trolling would obviously backfire.
And “by quietly” I simple mean adjusting it. I have no issue with that edit going on the public record in those circumstances. Just I would do it without necessarily bothering the OP. Or maybe it could ping them too automatically. I don’t mind.