Import AI to AE: AI Layers to Precomps
For rigging and organization purposes, importing should be more tight. I guess every program in Suite can be integrated properly.
When you "export as" ai to psd, for instance, you find every path created on illustrator in a folder/subfolder inside the layers tab on photoshop.
This could be really useful if you prepare a tons of bones and parts in a rig workflow inside illustrator and try to import this project inside after effects.
In a nutshell, you should be able to import AI layers in After effects as precomps.