During the 3 days I wfh, I get the most work done. I can focus and organize my day around executing a plan.
During the 2 days I'm in the office, I can get answers from people much quicker. Some people (new hires in particular) don't know how to describe their problem, or they're just really bad at it. My solution to endless teams convos is to just say "I'll head over to your desk" and then we work it out in person.
I think working with people in person can be very powerful. Is it essential though? No. Most corps don't even bother though. And most managers are bad at management. Working entirely wfh requires good managers with actual project management skills. Most corps are unwilling to train or prioritize hiring for that.