User blog comment:Chicken Bond/BIONICLE's Return?/@comment-2026417-20140918151518/@comment-2026417-20140918175414

I like gear functions for two reasons.

1) They give the sets "life," and make them more fun to have.

2) They add playability, and thus aren't just display models. These are toys, so the gear functions make them able to do more than just sit on a shelf and collect dust or get bashed together.

What's really nice is that if you don't like gears, you can just mod them out of the set with little trouble.