> This would have been a waste of their time if it was only an option for no one who wants this some place buried deep in the settings where it would only clutter the nesaserily complex options.

I'm not sure what this sentence means. Perhaps you already knew that Gimp's monochrome icons can be replaced by colorful ones by going to the Gimp settings under Theme -> Icon Theme, and unchecking the "Use symbolic icons if available" checkbox. That may be what you meant by "some place buried deep in the settings". But if you didn't, at least now you know how to get the colorful icons back.

The reason I'm making this comment, though, is to contrast it with Windows. A comment by chasil, left shortly after your own comment, said that "[a]n attentive steward of Windows would allow older gui themes (xp, Win7 Aero, etc.) to be applied for the nostalgic." Gimp has done just that: in Icon Theme, you can choose the "Default" or "Legacy" icon theme, so if you got used to the older icons, you can get them back. And you can still use the newer icon set if you like, but get the icons' colors back by unchecking a (confusingly-named, the name definitely needs improvement) checkbox. Windows doesn't have any built-in way to get the older themes back; if you want Windows 11, or even 10, to look like Windows 7 or XP or whatever version you trained your visual memory on for years, then it takes third-party software to make that possible. (And it may not even be possible, I haven't checked).

When even one of the most infamous-for-confusing-UI pieces of open-source software (I mean Gimp, of course) is doing a better job of providing good UI than Microsoft is, Microsoft has a problem.