For the web apps, I disagree, as I personally would never consider a desktop electron app a good case. That is one of main reasons I prefer telegram. Good to see Whatsapp also moved this way recently, somewhat. Can’t expect google to do the same.

By questioning why would apple do that you are missing that it never really did anything like that, and therefore it’s unlikely to be the case anyway. This time, apple didn’t really need to spend any resources to allow some integration and it spent them anyway, to try and block so called unauthorized albeit fully capable clients.

It’s foolish to assume apple would adopt anything like that instead of coming up with a product of its own. You ask “why apple would adopt some bad protocol” but not “why would apple not let a good protocol used by others”. “Why would google not create something that others would adopt” but not “why would apple not create something that others would adopt”. This is kind of apple centric, a bias I’d say.