It's because people got used to using screen share in X11 when they really want remote login. You cannot do remote login if there has to be someone sitting at the PC to approve it. Since Wayland has no remote login model, people are left trying to kludge together something out of screen sharing. I can guarantee the moment login over RDP becomes available everyone complaining about the screen sharing will quiet down. And yes, I know this is "not Wayland's concern". Kicking the ball does not fix the problem of "if I switch to Wayland I cannot login remotely". There needs to be a parent project which IS concerned with all the use-cases people require to function for a full working desktop experience. Otherwise you get left with this fragmentation, which isn't good for anyone. Basic OS services being fragmented between implementations really sucks. Microsoft figured this out 30 years ago.

If everyone appears to be missing something that's so easy to understand and implement, perhaps they're not missing it. They could have a different security/threat model than you're using. They could be expressing frustrations with being forced to manually approve something every time. They could be hitting dumb bugs in the implementation. There could be different people clamoring for more security and less intrusive security.