Actually Ubuntu is not less usable than Windows 10. Ex on intel NUC - wifi on Ubuntu : out of box - wifi on windows : plug ethernet, install driver manually. Old printers works better on Linux, eg when driver do not work on windows 10. Libre Office outof box, Office : where is my key ? ...
The problem is Ubuntu, but that consumers have migrated from desktops/laptops to Phones. (Bad for Linux, and bad for society as it's much easier to be a non-passitive participant on a desktop/laptop.)
for most people app selection on ubuntu is big enough to never need anything more
only professional/rare software sometimes has no support/suitable alternative
Oh sorry, that's not supported. But here's a post by some guy on some forum who says he made it work by doing a bunch of complicated things no one understands.
Yes, while this has issues of its own (as long as the web services they are using are centralized and corporate controlled) I have observed the less technical users I have been helping with computer issues are totally happy as long as they sit in front of a computer with a web browser, where they can log in to their online accounts and get going.
Some might want a full mail client and possibly a printer configured and that's about it.
