Procs on objectives
Can I point this out?
's Q can't be used on towers because it would be crazy to allow that three times in a row.
However, the infinitely stacking attack of someone who can build full tank and still deal 1000 damage an attack to towers doesn't just work on towers, it works on the Nexus and inhibitors too.

Just Maybe that shouldn't be allowed on inhibitors and the nexus.
It's fine on towers, but the inhibitors can't defend themselves at all, and without the increasing damage of a turret, it's lmost impossible to stop Nasus from getting one even with two people.
Aside from that, his presence even in a 4v3/2 against a non-damaging structure generally means that structure is going to die.