But if I had to add some new features, I would allow people to upload a small picture as an avatar. Maybe add a bio like LinkedIn, so when you click on someone's profile, you could see their work experience, education, etc. It would be nice.

In my opinion, I don't need to see anyone's work experience, or a picture, or anything else that could easily be fabricated, distorted or misconstrued.

Stay around long enough, or simply read the post history of someone, and you'll get a picture of their experience, knowledge and personality.

My resume is my post history, and the software I have published. I feel that the way I am treated by others here is a direct representation of how I've presented myself. It matters not where I have worked, what I look like or where I went to school (I didn't; I'm a high-school drop out).

...besides... all of the things you said you'd change here were long available on LinkedIn, and according to your very own words, that didn't turn out so well (and I won't even make a single comment on Facebook... I gave up all social media a decade ago).

Also, the names you mentioned in your post would all be listed as part of the group of Perlmonks whom I hold extremely high regard and respect for in both their technical knowledge (programming and otherwise) and in the way they personally present themselves to both questions and people. There are several others here much like them.