Well then sway maintainer's reason to explicitly deny support for proprietate nvidia driver is a reasonable argument too.
Definitely, it's his software and he can do whatever he wants, and I'm not criticising him, I'm criticising Linux for not offering a stable driver API. As far as I know they don't even want to allow shims like the one Android Treble introduced. It is not a technical decision, it's a political one.
Refusing to open source their drivers is not a technical decision, it’s a political one.