My Corsair keyboards do not require an app to be installed forever.
If I want to customize colors and whatnot I need the app, otherwise there are some presets on the keyboard itself.
If I customize the colors, I use the app and do it and then uninstall the app and move on. This is presumably MUCH easier than trying to do this without an interface directly on the keyboard which I suppose would be the alternative.
It WOULD be nice to just be able to edit a text file and copy it over.
A high school education ought to explain why this isn’t possible.