Dynaman was the first to use spandex.
Still, it was six cloth-costumes versus 29 spandex costumes...it's not hard to figure out why the switch to rubber/leather/whatever might upset some purists. This isn't as small of a thing as Gekiranger not having belts.
I like that Go-busters is trying something different, I'm just not sure I'd want it to be the regular thing for Sentai.
I think the leather look fits the upcoming theme, but I want it gone if the next series theme dosn't mix.
Imagine a Battle Fever J series with leather outfits:redface2: