Android isn't a desktop operating system and mobile device hardware continues to be a huge mess.
That doesn't stop you from buying a PC from Dell or building one from parts and installing Debian/Ubuntu/Mint/whatever-you-want on it. The percentage of other people who do that is irrelevant because the absolute number is still millions of people, which is more than enough to sustain a community and produce a competitive user experience.
I have an old computer with Windows on it and would turn it on once in a blue moon for the occasional thing that required Windows. It has been years since I've had to use it.
That doesn't stop you from buying a PC from Dell or building one from parts and installing Debian/Ubuntu/Mint/whatever-you-want on it. The percentage of other people who do that is irrelevant because the absolute number is still millions of people, which is more than enough to sustain a community and produce a competitive user experience.
I have an old computer with Windows on it and would turn it on once in a blue moon for the occasional thing that required Windows. It has been years since I've had to use it.