This is an excellent point to bring up. I too believe that for some systems we have too many templates.
I some cases I understand, For example; Sega Genesis and GameGear cartridges were originally shipped using several different cover formats. The red/orange stripe did not become the norm until the Sega CD system came out. But do we really need 5 red/orange templates? Maybe not.. maybe just one will do.
But in some other cases, I think we have too many templates. I’m not sure we need 4 SNES templates 2 VirtualBoy or 4 PS1 templates. Or the GAGILION of windows templates.
BUT………..This is after all a game art website in which we encourage members to bring out their talents when making a cover. Being that we all contribute on a voluntary basis, we have no right to force people to use a fixed template. (but we can always encourage it

)
My 2 cents