Anecdotally, prior to the ubiquity of tablets, I've observed several computer illiterate relatives thrive on Ubuntu systems (gnome 2 and unity) because they needed a PC and I passed on an older machine with a fresh copy of Ubuntu. My uncle who had never used a PC more than 30 minutes at a time before I gave him an Ubuntu laptop half a decade ago barely uses his 2015 MacBook that my aunt bought him for his 62nd birthday because he is so comfortable with his Ubuntu machine.