> It really is not, either in theory or more importantly in practice (cf the billion devices that ship Android or shitware ARM trinkets that ship Yocto builds with forked kernels that can't be updated, userspace blob binaries, etc.)

Android is not desktop, and as I understand it, neither are yocto-devices?

We are specifically talking here about market share of desktops, not market share of linux-kernel or the gnu-userland. And while there is some overlap, I don't think it makes much sense to mix those statistics as both have different purposes.