I think "hardware security" of Google phones sounds nice on paper but you never know if these is some NSA chip or some other exploit build in that the Graphene OS devs never know about. I do not trust Google AT ALL and would love for them to support different Phones, because /e/ is does not sound very secure in comparison, they build on Lineage OS and they actually lowered security to widen compatibility AFAIK and I guess /e/ OS is just copying + de-googling.