I just started a 95% remote job (basically a day every two weeks), and the mentorship/onboarding/integration is actually better remotely. When we are onsite, we discuss stuff, we discuss about previsou jobs and work a bit, but we cannot isolate, the open space is loud and it's tiring tbh.

Remotely, i ask "hey, i'm doing task #WXY-99 on project A, who can explain the stuff to me", and i have a two-hour mentorship on the project specifics. And sometimes more. I was taught a lot of stuff.

But the management is the best management i had in my life (Ie very hands-off, but with strict work procedure i had to learn the first day), and they discovered the way to make me twice as productive: 5 hours of meeting maximum every week (as i'm new, i have 3 hours on average). The rest should be work or one to one.

[edit]: And we do a lot of 1:1. Lot of reviews, pair programming, mentoring, discussing new feature, designing a DB... All that stuff that i used to do in "meetings" with 10 people are done on 1:1. Its faster, its a lot less performative, thus more productive and make the interaction more "real".