If you're someone like me who has a bunch of resource packs, like half a stack of them, organizing your textures might be a pain
Notice the size of the scroll bar
And sometimes, you might want some textures from pack A and some from Pack B, but you don't want Pack B overriding all of Pack A's textures (if that makes sense)
and don't get me started on pack organization, deciding which packs to go above or below is an absoulute pain
So I present [Enter_Mod_Name] You can pick each individual texture for each and every block or item or gui etc.