That's not been my experience. I've worked both in offices and full time from home for a long time.
You most definitely do share local culture and camaraderie with others working from home. I constantly spend my time on chats, calls, meetings and in pair programming sessions.
We definitely have private jokes, productivity tips and everything else that would go on in an office setting.
This whole argument just stinks of people in private offices wanting the plebs in a shared space so they can maintain status.
There's quantified evidence that shared office spaces suck for productivity. If Altman, Igor and the rest want to force people back into offices they should gather some hard counter-evidence. Right now it just sounds like excuses for micromanagement.