> If you can connect or collaborate in a hallway, you can also do so in a Discord channel (or whatever tool).
I don't believe that, those are very different modes of communications.
> There are also several good applications for internet collaboration that simulate a rich shared 2d or 3d or video space.
I think, this could potentially help, but we seem to be still very far from it technologically. It's still impossible to achieve a realistic eye contact. Audio in calls is still tragically bad - it's actually somewhat shocking that nobody was able to figure this out yet, it feels like there was hardly any progress in the last 15 years.
Personally, participating in a remote meeting is very noticeably more demanding for me than an in-person meeting.
> Networking, mentorship, company culture, etc. can all happen over the internet.
Might work in theory, but in my experience not in practice. My company tried to organize some socializing remotely, but the attendance was dramatically lower than in the in person events.