highly problematic because it's hazardous and radioactive?
Thing is, there's very little of that waste, with much less impact than say, burning coal.
Also, it's highly radioactive only when taken fresh out of reactor - this waste is stored in pools, until it decays. What you're left is weakly radioactive, long term waste that needs to be buried for a long time.
This isn't sarcasm - operating system isn't a toy. Most people aren't using OS just for the sake of it. It's a tool to run stuff you need for work/entertainment