With everything available on demand, no one wants to commit for long.
So much of what you've written resonates so well. The bulk of the friends I have today were from high school and College. I've met infinitely more people since I left college and talk to a lot of people, but just fear I (we?) may have lost the ability (or will?) to make those meaningful connections
New people aren't familiar, but will never be, before we move on. I have very few friends that know me for more than a decade, but the ones that do are very good friends. I am trying to expand my circle again, but it is hard.