I had a barely-used lenovo that I had put xubuntu on that I wanted her to try first to gauge her size and performance requirements, but she wasn't ready for linux. I searched around a bit (knowing putting windows 10 back on there was not an ideal experience) and came across RemixOS, a version of android for PC.
That's when it clicked for me. She didn't need a traditional PC. What she really wanted was her phone in a bigger form factor (with usable keyboard). I was able to get all her apps on in a few minutes and she had a workable system with nearly no learning curve. I suspect this will be the case for more people as time goes on. I'm in favor of a competitor to windows, and I now think that is android, not linux.