If this was something that they would have instant access to then I would be all for the nerf. But you have to account for the fact that they are giving up their over shields to provide more damage and then some with another perk. They need to give up 2 nodes on their subclass. Meaning they are still vulnerable outside the bubble and other supers will still counter it as they always have. So I think it's relatively fair. And it gives that offensive play to the Super too