I have one point of contention. You mentioned that many of the posts in #introduceyourself are not new users. What's wrong with that?
When I first got here, I knew next to nothing about the platform. For my first post, I decided to explain what brought me here. At the end, I sort of introduced myself a bit, and said what kinda content I'd be posting. I don't want to share too much about myself though, and blamed that for why I didn't get many upvotes. It was shit though. I went all over the place. Users that have been here for at least a little while will have gotten the hang of things, and be able to make a much better #introduceyourself post. Perhaps not people that have been here too long though. People that have been here months might want to give it another go though.
I actually question posts in #introduceyourself that are too well done. If you just got here, your first few posts should probably be shit, as well as your #introduceyourself post. If they aren't, I wonder if they got some coaching, or have been hanging around for at least a while.