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KDE Devs, I Love You, But Please Remove This Feature
(discuss.kde.org)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
It's more about which category a particular specific software belongs. If a kid installs an educational app/game that teaches programming by giving instructions to a turtle in order to draw a graphic/picture (I think I have seen something like that before). Which category should it be? games? education? development? graphics?
I personally don't use this kind of menus with categories, I prefer dmenu style launchers where you type to search what you need. But if I was the kind of people that do use this kind of menus I would probably find that kind of indication useful.
You are right, the marker at the category level definitely makes sense to find the application initially.