I don't think there is much difference between blob and such code from the kernel maintainers' point of view. From users' point of view the difference is huge (freedom to tinker / fix bugs), but maintainers need to keep the whole kernel maintainable. Merging such code would be irresponsible.

And no, I don't want just "good" code in kernel I am using. This is not business. Make it maintainable so it can get better (perfect) in the long run. (yes, I know there are places in kernel where code is not even good, let alone perfect, but that's another issue altogether)

The thing is though, if they shipped a driver like Nvidia does, where it's this blob that just wraps its tendrils into what ever systems are needed, that's not the graphics maintainers problem either

It's a net loss for users of AMD hardware (though AMD's hardware on Linux has been a dumpster fire for as long as I can remember) because they have to suffer arguably worse driver support, but that's on AMD for wanting to have their cake and eat it too