I think the essential office chitchat issue is "being yourself" vs. "seeming like a high quality professional". I've found out the hard way that relaxing and aiming for a real conversation carries a high % chance of saying something unbecoming of a team leader. Better pay attention to appearances when you're at work. I don't understand coworkers who say silly things at the lunch table without a second thought, or tho…
Indeed, this is a very good way to put it. Although I do understand people who say silly things at the lunch table without a second thought - they value fun and genuine social interactions more than "upward mobility".
If you can't be yourself for at least 8h/day and you also can't be yourself after that, because you shouldn't base you social life around your co-workers, then who are you? And when are you allowed to be yourself? Weekends and bank holidays? Fuck. That.
We would all be happier if we were allowed to be ourselves all the time. Maybe by hopping around until landing on a cluster of likewise co-workers who can see the "high quality professional" side by side with the crazy cat lady or the punkrocker.
But again, I think your decription is correct and that we live within a very sad state of affairs.