Paints and storage.

[Jakko]

But the principal still applies. Paints don’t have to be used so specifically.

True, I meant mostly that it makes it more difficult to sort things neatly into different racks. My method is much like that of @MikeC: I have drawers that are sorted mostly by brand, as that is usually my main consideration. “This needs to be painted olive drab, and I think the Tamiya one is about the right shade.”