Except it’s not a buff. It’s a nerf disguised as a buff.
25% cooldown increase with limited range and perfect timing required to save a teammate. And in order to do so, you need to position yourself close enough to them. Not only are you almost never going to save anybody, in the rare event you do, you will just end up dead 1 second after doing it.
Any time Moira blows fade where enemies can see her she is instantly deleted. Without fade, she’s actually even easier to kill than Zen as she has a bigger hitbox, finite range, less lethality, and in this case, will have to put herself out of position to save a dying teammate.