What is the deal with them not letting people enabling mods when a required mod is deleted?

I absolutely love vehicle mods. I went to download this mod, AUC Vehicles, because it looked promising, and then I see “CIE ATGM download failed.” That leads to my question why can’t they let us play with a mod even without the dependencies? Sure, some stuff would be missing, but still let us play with the content instead of locking it forever so other people can’t use it when a required mod gets deleted…