> I doubt Linus ever talks to the GTK people in any meaningful way

Interestingly he has had arguments with them over the years, most fervently related to the development of https://subsurface-divelog.org/

"GNU/Linux" can still mean too many different things. Even ChromeOS qualifies as that. You want GNU/Linux help, you need to specify what DE and everything. Or as the other comment said, what Bluetooth stack. You can say you're using Manjaro Cinnamon and either that's not specific enough, or someone says it's your fault for not using KDE.

I'm comparing to Windows or Mac. There's only one Bluetooth audio stack in Windows. If you want help with it, whatever you find online will apply to you, unless of course you've gone out of your way to swap it for another. Unlike Windows, Linux is open and people can build their own flavors, but those can have their own names.

Don't even get me started with how Ubuntu changed its entire GUI like 3 times so that it's unrecognizable each time. Feel bad for whatever IT departments had to keep taking new screenshots of how to do stuff.

If you don't like the above there are several BSD systems that give you a useable OS. You probably want a deskto though which none give.