Why does Skull Merchant's drones have such a long cooldown?

I can't think of a scenario where I would go "Oh no, the skull merchant placed her drone a couple seconds after another. Too OP, needs nerf." It serves no purpose most of the time, and if it does, it would just be the potential to maybe hinder someone in a loop, or maybe get a small haste boost.

Not only that, why does placing a drone make you 110 while clown's bottles don't slow you at all, and have a greater effect, and are easier to use? They fucked this killer so badly that only now do I feel so bad for anyone playing her, after having adepted her myself.

This wasn't a fix, this was murder.