After using Linux for something like 15 years, I can't remember the last time an installation didn't go smoothly. Everything has always just worked without any tinkering. I have played around with a few distros and installed quite a few apps over the years. Often it was just curiosity that motivated me rather than actually needing the app. Once again, I can't remember the last time I struck a problem.
I have also installed Linux on a few machines for friends, all of whom are over 70 and none of them have had any issues.
Maybe the fact that most of the installs have been on machines that were a few years old is part of the reason there have been no problems. Although a couple of them were reasonably new laptops.
I don't doubt for one minute that others have had problems and I don't suggest for one minute that it is their fault. I just want to make the point that not everyone has problems and not everyone needs to resort to the CLI to sort things out. Some users manage to do all they need to do without ever being aware of the OS on their machine.

