One of the nagging questions/worries I have about the increase in WFH is greener employees. I've entertained summer interns for the last 11 years at work. And I've tried to help some older but newer-to-programming peers.
I can take "experienced" contractors/helpers up to speed in one of the many domains I have to work in pretty quick. Share some code. Some chats/emails. Couple desktop shares, it's usually enough to bootstrap an ongoing remote conversation.
With younger/newer/greener people, I have found this to be nigh impossible though. I don't like the optics of "you need to get some experience before you can work from home" and it also begs the question "who's going to show up in office to do the mentoring." I do see this as a problem that's not getting addressed.