I am baffled any time I’m on facebook how horrid it is. Loads insanely slowly, won’t accept picture uploads at random, randomly doesn’t let you share to people in your friends group (it will just hide people for no reason). Such a terrible website. Sadly I have to stay on it for friends and music reasons (there is nothing else anyone I know uses) but man, it’s crazy how badly they want you to install their spyware app so you don’t use the browser version.
I get what you’re saying but it’s not actually that kind of all or nothing situation. I’ve never met a person that would only do FB or nothing at all. Everyone is browsing FB on their phone anyway so skip the middleman and start a group message thread. Easy solution that takes almost no effort or adjustment. Nothing will ever improve if people like you and I refuse to change our habits even slightly.
For me the main thing not letting me quit WhatsApp (and FB before that) are groups and distribution lists. My cycling club uses WhatsApp to share info about all events. They are not going to move 300 people to Signal because I don’t want to use WhatsApp. Same with climbing gym group. 30 people, everyone using WhatspApp. I proposed moving to Signal at one point but no one even knew what I was talking about. It was the same with FB, people would post announcements on FB and if you wanted to know what’s going on you needed an account.