> But really, it's even easier to just store it all on-site.

I agree with the rest but on site storage of high level waste is a terrible idea. Even after vitrification that's material that will remain dangerously radioactive for longer than agrarian human civilization has existed. Ideally it should enter a disposal chain that keeps as little of it at ground level for a short a time as possible in order to hedge against the long tail possibility of a large scale disaster stranding it on the surface.

I think the finnish plan to bury it on site 500 meters down in bedrock is a decent one.