I'll just add one thing: auto-lock for topics that haven't been replied to in, say, a year. Or two.
We constantly have threads bumped that are from 2016 or 2017. People see those problems that were solved half a decade ago, questions from someone who hasn't been on the forums in +3 years, long-dead collabs, one of the 66666 threads on the same exact topics... and for some reason still decide to necrobump them.
I disagree, I think it'd just make the forum feel cluttered to have that info displayed all the time. Really if someone cares to know these there's nothing stopping them from clicking on the profile.