> I'm somewhat surprised that Windows is still most of personal computers.

The reason is simple: Microsoft has a lock on PCs used by corporate and government employees, so the vast majority of people who use computers at work use Windows computers. And so they naturally buy the same kind of computer for home that they're used to using at work. People like me, who run Linux at home even though I'm forced to use Windows at work, are outliers. And probably always will be. So the only way for the Linux desktop to really take off would be for large corporate customers and governments to switch from Windows to Linux. I would love it if that happened, but I'm not holding my breath.