Thanks for all the informative sources. First of all, I think you are probably right that it is a political or rather economic problem, not necessarily a scientific one. Capitalism doesn't give any incentive to care for the environment or to recycle anything if it isn't profitable. And politics are heavily influenced if not driven by capitalism.

But then, seeing the various articles you provided about nuclear waste storage, I didn't really get the impression that it is a solved problem. Sabine Hossenfelder spends a very long time talking about what nuclear waste is but only mentions problems with storage for hundreds of thousands of years for a very short time. And also Elina Charatidsou doesn't even mention potential problems of geological changes etc. And the facility she is presenting is still in the research stage. So where are the solutions for a long-term storage that guarantees safety? Nuclear waste may not be as problematic as it is made out, but real solutions look different to me.

Very interesting also the point about recycling nuclear waste. I haven't even heard of it and it sounds like a really good thing to do. We'd still have very high costs handling and storing it, but only for a few hundreds of years at least. Although it seems like actually applying this is still not really planned by most countries and even then the problem of nuclear waste doesn't go away fully.