If you work with someone in an office, natural opportunities arise to grab some time, whether it’s when they’re bumbling around the office, grabbing something to eat or walking from a meeting.
A remote company can create an environment to address these problems, with structured time for conversations but it is very difficult to get right.
I am a fan of both remote work and in office work. Remote work is cheap and has little margin for error; in office is expensive as it is paying for guard rails that make it (relatively) difficult to get wrong.
It certainly doesn't seem to be fear that allowing WFH means they will lose their competitive edge in their industry. Agree it's more about the capital/labor relationship potentially fraying.
The labor movement LARPing you see every so often online I think is ridiculously premature. The labor movement at the turn of the century was ridiculously volatile and borne from a ton of unrest. It's a ways away.