I won't do other people's installs anymore as the support adds up, such as Powerpoint presentations not opening properly in LibreOffice, but the systems just work. Most people spend their entire time in a web browser anyway, so there isn't much to go wrong.
Note that I praise Ubuntu as a desktop even though I personally use CentOS as my desktop. It is Ubuntu that brought Linux to the masses.
I think this part of your comment is key:
> I have had zero problems that took more than a casual google to solve
The problems I have on install are (almost) always solvable in an hour or so of Googling and messing around in the terminal or in config files. That includes the two examples I gave earlier - I've got those working now. But that's an hour for us, people who do this stuff every day. A random person who isn't so good with computers and decides to try Linux really needs everything to work.
Even this:
> Most people spend their entire time in a web browser anyway, so there isn't much to go wrong.
isn't always a safe bet. I installed Ubuntu for someone who basically just wanted to check emails, write documents, and watch some on-demand TV. The on-demand TV site didn't work because it needed the HAL layer in Flash and that'd been removed entirely from Ubuntu. Luckily someone has kindly hosted a repo with the required files[1]. But a random newbie is never going to get that working. Yes, the site requiring Flash like that is a bit out of date. But it still works on Windows and Mac.
[1] https://launchpad.net/~mjblenner/+archive/ubuntu/ppa-hal
Haven't had any Mail.app problems yet but I run an empty inbox.
Also, they are currently in the process of rewriting the build system, with a preview shipping with Xcode 9.