Annie- why does fire stun?

It has never made sense to me that Annie can proc a stun on her abilities. So I think her passive needs a rework. I don't think she should be nerfed- she's already too easy to kill. But- modifying her passive is reasonable. Fire doesn't stun- electricity does..

Here's a suggestion. Instead of stunning, her next ability should create fear for the duration. If Tibbers comes at me- I'm not standing still, I'm getting the hell outta there! Annie is a child, making her be able to hold down enemies with stuns is a bit much. She should be more like a child- less aggressive gameplay. This means her abilities should come to her rescue- if a threat is near, her powers protect her and ward the threat off- like a ghost..which is practical because a pyro kinetic child seems paranormal to me. Paranormal creates fear.

Thus, we should be afraid of , Not stop and stare in awe.