The inhibitors: What are they really up to?

So the inhibitors on the new SR. They don't really look like they do anything. I know the old ones weren't that appealing to the eye, but look at these things. They just sit there, tied down like they're gonna fly away. The headcannon I had with the old inhibs is that they were shaman or something casting spells and inhibiting the enemy super minions. You kill them and there's nothing stopping your super minions from spawning. Maybe it's just me, but these new inhibs just look like big rocks floating around for no reason.