I did notice something similar. We brought on one junior last year and I had to schedule about 5 in-person days with him to do actual pair programming to teach

I did notice something similar. We brought on one junior last year and I had to schedule about 5 in-person days with him to do actual pair programming to teach him some stuff. That said, I think what stopped me the most with being productive over video chat was not being able to point at his screen and had to describe in detail when I wanted him to look at something. Giving people a virtual pointer to point at stuff on the presenter's screen would be welcome.