'the crucial knowledge that only comes from personal contact'
Can you please stop spouting this utter rubbish phrase without actual research?
In certain very specific environments, it's possible to happen across a colleague or team doing something interesting, but this is very much job specific.
The rest of my team are in different regions of the UK, Europe, or half way around the world. It was that way before the pandemic and has not changed.
There was no 'crucial knowledge' that I came across from personal contact unrelated to normal projects or meetings in the course of my job. Any unexpected knowledge could equally have arrived remotely as opposed to in person.
It's true that many companies do not take training and documentation seriously, but instead of a stream of people asking for guidance from the same person, it is more effective to at best have professional technical writers or teachers dispense information, or at worst get the person with the knowledge to write the documentation *ONCE* so they don't waste their and the business' time endlessly and incompletely passing on information.
We're all IT professionals, there are tools and procedures (documentation, daily stand ups, operating procedures, training courses, gap analysis, post mortem checking) to work more effectively. In these days of fibre broadband there's no excuse not to use them, we're not limping on with 33K6 modems any more.
I started my career travelling around the UK, installing software using floppies, and having in-person meetings. I don't miss that, and I miss much less losing over two hours a day to commute to an office that whilst (to be fair) it is quite well equipped, has slower connectivity than my fibre connection, fewer monitors, and less flexibility about how I can spend my lunch hour. Whereas home has none of those disadvantages, plus backup 4G connectivity, and once I shift my arse in the new year, UPS backup too (not least because it takes my network switch 7 minutes to boot up from cold).