It’s because they think being dumb makes them tough.

I don’t think there are any other options - as I understand that would require coloring an icon on the fly, wether a default icon or a custom icon

Not sure if this is what you’re asking for but as with Dolphin 25.04.0 I can right-click a folder, select “Properties” (not sure if that’s the actual name in english; or just hit Alt+Enter), click/tap the folder icon within the modal and search for a color in the search box - lots of tinted folders (but not so much colors, though) shipped with the default Breeze icon theme

It boggles my mind people can bear a device that can end lifes in an instant and feel like they are fun. I guess this is making my unpopular opinion.

Do yourself a favor and hear that cover bit they did for Metallica’s “Sad but true”. They’re pretty good musicians actually but they just choose to do more corny/commercial stuff – which imho is not valid reason for the hate. Sad but true.