Everything you say is completely applicable to Android as well, and it's not clear how that is making the platform a non-option for people. Very few people installs third party packages.
The market share of any PC desktop operating system has mostly to do with the type of office work that took place in the 90s, when computers took over.
That's slowly changing as the web is taking over, and Chromebooks, Android, Mac, and "regular" Linux desktops becomes a viable platform for sharing your work with others.
