[exmadscientist]

Because it's a mostly unexplored corner of our solar system. The Voyagers were survey probes: they saw glimpses of a lot of interesting things, but couldn't stick around and solve any of the hard mysteries. (For example, just what is going on with the weather on both Uranus and Neptune? It's weird!) Orbiters such as Galileo, Juno, and Cassini are able to stick around long enough to do deep science.

Orbiters for one or both of our ice giants ought to be much higher on our space exploration priority lists than they seem to be.