Points 4 (file sharing) and 6 (hw compat), and part of point 1 (package distribution), are valid critiques. The rest, not so much.
The main reason Linux hasn't proliferated on the desktop is that businesses don't use it on the desktop and that's because they prefer to pay for a license so they get support if something goes wrong, and because Windows has always dominated business software (much of which isn't even available on other platforms).
The second reason is because Mac blows most everything else away when it comes to laptops; it's almost rare these days to come across someone that doesn't have a Mac as their laptop (unless it's a work-issued laptop in which case it's a Dell or something like that, or they want a budget laptop).
Linux is not likely to be mainstream for the desktop because there's not really a business model that drives it like there is for Windows and Mac. And that's fine. I use Linux as my daily driver for work (by choice), though for my personal laptop I have a Mac.
The main reason Linux hasn't proliferated on the desktop is that businesses don't use it on the desktop and that's because they prefer to pay for a license so they get support if something goes wrong, and because Windows has always dominated business software (much of which isn't even available on other platforms).
The second reason is because Mac blows most everything else away when it comes to laptops; it's almost rare these days to come across someone that doesn't have a Mac as their laptop (unless it's a work-issued laptop in which case it's a Dell or something like that, or they want a budget laptop).
Linux is not likely to be mainstream for the desktop because there's not really a business model that drives it like there is for Windows and Mac. And that's fine. I use Linux as my daily driver for work (by choice), though for my personal laptop I have a Mac.