There should be a way to change all vanilla colormaps with resourcepacks

In 25w03a mojang added a CIT sytem, it's great and has been requested for ages now, but I think we should also have the ability to change the game's colormaps with resourcepacks and no mods, we can already change foliage and grass so why can't we change redstone or water's colormaps, they don't even appear inside the minecraft assets folder, and I know there's a way for datapacks to change some of those values, but do we really need a datapack for something purely visual like redstone colours?