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> There is almost none real p2p webrtc traffic happening in reality because most people don‘t have enough upload bandwidth to transmit their video to all participating peers.

Many providers choose to use SFU's even when not needed because they have features like recording that require it. I've gotten much better quality and latency on normal webrtc than I have over slack, teams, hangouts, even over bad mobile networks.

That’s a design choice. The architecture doesn’t require a middlebox.

Most human interaction where videoconferencing applies happens in small groups.