What other hard CC is available for 1AP then?

The counter is pretty much killing the caster. Which as stated, enemies gladly help with, using their AP to kill a teammate and not attack us. Sure, one of the team still takes some damage, but one compared to all? Not a bad trade-off. As said, maybe it's from the few enemies using it, but I hardly ever considered it a threat, often being actually beneficial in them wasting AP and killing one of their own saving me from doing so.
I've yet to encounter an instance where them hurting each other to attack me wasn't in my best interest. I mean if you can take 50 damage, or take 50 damage and meanwhile deal 50 damage, which is the worst of the 2? It's like an actual efficient form of damage reflection (unlike the skill), which they willingly put on you, free of cost.