The big problem is that there's a bar to meet for Zoom which is higher than that to ask a question in the office. Rightly or wrongly, lots of people feel this way, and I ended up having to over-schedule meetings to make sure people got support.
Additionally, junior people are much, much less likely to have the space to make WFH effective, so they do benefit from having an office.
Don't get me wrong, I'm a big fan of WFH, but I'm pretty sceptical of it working for junior people as well as it does for senior. And even then, that difference will cause a bunch of problems.