I enjoy my colleagues and work environment (and wouldn't trade it for the world now that I'm mostly remote!), love to chat with them and keep in touch, but at the end of the day I already have my own friends with whom I have stronger bonds than the workplace, and I'd rather spend my free time with them rather than endless happy hours with work colleagues who are, in the grand scheme of things, really only present in my life for the duration of a job. Coincidentally, some of my favorite coworkers have this same outlook.
I concede this is all anecdotal, yes, but so is your generalization. I personally believe much of this youngest generation of professionals, of which I am part, already has relatively established social networks due to social media that someone even 10 years ago entering a new job in a new city would not have, hence the less need to rely on the workplace for a social life.
If you ask me, the future of the workplace isn't fully-remote or fully in-person, it's an office where everyone comes in 2-3 days a week, as necessary, and working remote or at-home the rest of the time.