Clickbaity title on the original article, but I think this is the most important point to consider from it:
After getting to 1% in approximately 2011, it took about a decade to double that to 2%. The jump from 2% to 3% took just over two years, and 3% to 4% took less than a year.
Get the picture? The Linux desktop is growing, and it’s growing fast.
The preinstalled apps are not a feature of KDE (or Gnome, XFCE, etc.). Actually they all are structured in a very modular way where you can use or omit individual components. Firefox and LibreOffice are completely independent of it even; they merely add compatibility layers to make the integration more seamless.
What you experienced was something to attribute to the distribution you chose. They are the ones to decide which components to bundle and preinstall. That is also the reason why so many distributions exist in the first place, because different teams/devs have different visions about what the desktop should look and feel like after install.
So the preinstallation of all the KDE apps is a choice of the distro?
On both Linux Mint and Debian+Plasma I got some apps preinstalled. That I can uninstall and that they arent developed by the same people doesnt play a role. For the user they come with the OS, like Win10 preinstalls the calculator and Candy Crush
Correct.
That’s my point, though. Plasma isn’t an OS. You can can have a OS that ships Plasma with Calligra instead of LibreOffice and Falkon instead of Firefox. Or neither, and instead they give you a greeter with the choice to pick your browser. Or the OS is minimal and doesn’t bundle any of them. In Arch for example you normally don’t even get Konsole or Dolphin unless you install them (or you pick the nuclear option and install _all _ KDE packages which also includes a ton of stuff you likely never need).