The "I didn't know about that feature!" thing is partially on me, I don't really publicize this stuff. I'm a web developer and I often forget that other people use sites differently. I'll just poke around a site just to see what it does and can do, just because, out of pure habit, while most people will just go looking for a thing when they want to find it and not before, look for it differently, etc.
That said, I have occasionally been
shocked at the things people ask me even after years of using the site.

I say that with genuine amusement and no malice at all. Sometimes I'm even kind of impressed at how often people manage to get by without certain functions that I use on a daily basis.
But yeah, this is all good stuff, glad I was able to highlight it, and hopefully I can make some changes to profiles, in particular, that lead to some of these other things. Making profiles more of a centerpiece, inviting people to customize them and using them as a gateway to other stuff, probably makes sense.