but I no longer believe that it is possible to build a competitive federated messenger at all.
The fact that we have a telephone system that works with separate providers contradicts this sentiment. If I want to pick up the phone and talk to my cousin's puppy in New Zealand, I can do that without creating an account on his provider's service.
I don't understand why we've forgotten this as a society. Yes, it was difficult to upgrade the phone systems over the past century, but it's worth it in my opinion. I really wish we'd start seeing government regulation that says "you should be able to talk to someone on a service without having to create an account on said service." I thought the DMA would do this, but sadly, Whatsapp still requires an account to talk to people using that service. Very disappointing.
I'm surprised this hasn't been said yet... but what I hate most about Signal is its requirement for a phone number. I don't want to be identified, and I want to be able to create multiple separate accounts with different identities if I want to.
I also hate the fact that it's a mobile-first service. Yes, there is a desktop application (and just one really crappy one at that), but it's clearly designed to revolve first and foremost around your phone and be virtually impossible to use without one. As someone who hates writing on a 3-inch screen, this is a also non-starter for me.
I understand the arguments about perfectionism, but this is too much. I'll stick with XMPP, Matrix and IRC, thanks.