I don’t think the “bad for younger/junior people” thing is speculation. My team had an intern who was toiling away at something for two+ weeks that I resolved for him in 10 minutes the one day I went to the office for that month. It was slightly mentioned in stand ups and even meetings, but remote work doesn’t mean less meetings and frankly people (myself included) have even more divided attention during remote meetings because it’s easier to multitask and tune out things that aren’t immediately relevant to your work. That happened a bit before, but it happens much more often in the remote era.

I think remote is better for personal focus, but at a small cost to team focus.