> AMD GPUs require AtomBIOS which contains bytecode (that is: blobs) to initialize the GPU. If you look at the Linux drivers, they come with an AtomBIOS bytecode interpreter for that purpose.

I'm failing to see how this is any worse than the current situation with Nvidia drivers, especially if System76 is preinstalling them. You'll need blobs either way. You'll arguably need far more of them for an Nvidia GPU than an AMD GPU.