How is that meaningfully different from a system like Signal or iMessage where you need to trust Zoom that when they say "this is Bob's fingerprint" they're actually giving you Bob's fingerprint and not their MITM key? They still need to keep their promise, there still is no technical hurdle.

(Signal gives you the option to verify fingerprints out-of-band but their UI discourages using it; iMessage doesn't even do that. I mean, maybe the answer is we collectively decide to stop calling iMessage end-to-end-encrypted....)