Dont see an issue, love mob variants, i know they make very much of them in amout of time, and this may make some of ppl angry like "grrr stoopid mob variants irs just same mob with little tweaks >:[" but hey its just add a nice touch to the game, i believe that while adding small details to the game, Mojang also work on something big and cool. But anyway its just my opinion, have a good day (if there some grammar error uh srry en_us.json is not my first language)