Yeah, I appreciate all the advantages you listed of in-person meetings. I can believe that some of the advantages that currently come from physical meetings could be recreated in purely-online meetings, but I think the problem is that it doesn't happen naturally as an extension of normal human activities; it would probably require research and a lot of conscious work to structure the correct processes to do it. It seems like an open question how far one could get with a purely online approach.
I'm glad to hear that the IETF does so much with the hybrid approach; I often find hybrid meetings to be highly dysfunctional for either the online or in-person side. I would suspect, though, that it still means there will be effectively be a two-tiered system where, all things being equal, the people who attend in person are taken more seriously. This makes some sense, since attending does require commitment of time and money, but it also works against people with less money, health conditions, or certain nationalities.
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