I wouldn’t engage with them personally. I use grapheneOS. I would use their matrix for support only, but we already know the community is a little… errrr… defensive. Definitely not the place to debate stuff like this, and those folk involved are pretty bright anyway.
“Android immutable model could totally work with more customizability like desktops, and still be secure” - I read this, and don’t know enough, but I’m wondering if this is a selling point of a rival of theirs. I think they’re very precise and ardent on secure. Some of their rivals allow more flexibility, and less secure, so it could have been a conversation they’ve had millions of times with people trolling them. Obviously, they’re quite sensitive, and react way beyond the pale, but good policy is don’t troll folk that may need mental health help.
The fact you know Daniel, and the history, and went in their to debate is really quite questionable. “I wonder what would happen if I take this box of matches into this room full of flammable material”. It’s weird you’re asking people to go in and debate with them. Why are you advocating this? It’s like you’re wanting to troll them, and while there is often not excusing some of the actions on that project, what is your goal? Subtle trolling is a thing.
Either way, use what software you want. Their matrix is run by them, and they define the rules of how they operate. It isn’t a public entity, it’s a private club.