So someone looking to buy a new machine has a few options. They have MacOS, Windows, Chromebook, or Linux. And there’s a high probability that when they’re at a shop be it online or in person looking for a Linux machine it’s probably going to be Ubuntu.
You don’t get to tell the user, “well you picked the wrong distro, lol” when all they wanted was something that runs the software and hardware they want. The vast majority of users want something that just works, not have to become some expert.
And also, it’s rather dismissive, I show an example of Linux doing the same thing that Apple and Microsoft do… Ubuntu is still Linux.