Indeed. Star wars has the futuristic feel to it, yet it claims to occur a long time ago. When you look at it like that, you can either add both tags, or neither. One of the two would simply not fit right.

anyways, we presume tying the tag system to the search system is a feature that will take far more work to implement, right?
(same goes for filtering away tags (i.e. hiding everything with a tag))