I'm at a big (Google/Microsoft/Amazon) workplace and WFH has always been a last-resort thing. I can't even imagine my team moving toward this. Every day I do too many things in the office that are face-to-face. Drop by the architect to get an opinion about XYZ, drop by a PM to ask about their functional spec, drop by a coworker to ask about some comments they left on my PR. Get three people in a room to go over an ongoing incident that's impacting a major customer's operations.
All these things could be pings/video calls, but having done that for a few months now, it's just not as effective as being there.
I wonder if the "WFH" discussion on HN is simply silicon-valley wishful thinking, if it's only possible for highly independent contractors and startup-hopping tech bros, and if it will never actually work in a large workplace environment.