It's not a breeze for everyone. If I run into a maxed Kenobi team I can still get shut down, I'd definitely appreciate being able to just eat Kenobi.
That said I don't often get shut down by that nonsense, but I sometimes do.
I think the issue for the devs is more that you could bank annihilate on node 1, and then leave Nihilus on the bench. You wouldn't need to actually build him up to full power to do this, G7 would probably be enough.