i don’t see why all flat reducts would be nerfed, and spam aegis is one thing that enables a different playstyle from cd aegis, aside from cdr specifically having existed/been allowed for years 
in this case the community outright suggested to nerf the new cdr mod on amulet, because it might be a bit much with the other effects, not that “spam”/pseudo spam sigils was meant to go away completely, but more like target dmg nerfed while not impacting other “spam” sigil dmg type builds the same.