That and safety/containment in the event of a mishap. I should add also that generally it's not the super high activity waste like the fuel rods or the low act

That and safety/containment in the event of a mishap. I should add also that generally it's not the super high activity waste like the fuel rods or the low activity waste million years half-life stuff that makes things problematic but rather the heaps of intermediate activity waste that's active enough to require special equipment and procedures, too irregular to easily streamline, too long lived to just wait out and too voluminous to just stick it in a very secure container container somewhere. For that, a deep geological repository is mihc safer, simpler and cheaper.