I am glad the author discovered how far modern GNU/Linux based distros have come, and that they are, indeed, very suitable for the majority of "casual user" use cases (email/web/videos/basic office).

I don't think that it's very surprising today, though - as often pointed out, every Android user is technically using Linux for all of the above (and more). It already is mainstream. On the desktop, not, obviously. But it could, if people had enough incentive to make the transition.

edit: typos