Those nuclear advances are what makes nuclear feasible under the new regulations. Those regulations that prohibit the older, less safe designs. But those old designs are also cheaper. It’s why the vast majority of the least safe reactors are in the former Soviet Union; they had to be built en masse, and it had to happen cheap.
Goverments around the world would still be building the cheap unsafe shit if it weren’t for nuclear scientists aggressively recommending stronger regulations. It’s also why it’s always politicians and other idiots who advocate removing those regulations, and not the nuclear scientists who actually know what they’re talking about.
Nuclear also isn’t slow to build just due to regulations. South Korea is an example, where they built plenty of reactors with build times of approximately 5 years each. They still have regulations and red tape, but they also heavily standardised their reactors and their manufacturing. But most western countries just want to build one or two or so, and that just means doing a lot of work that you can’t copy from anywhere.
Nuclear is best done in bulk and in collaboration with others. The EU could for example launch a nuclear initiative to build say 100 reactors all across Europe, which would allow us to take advantage of building at scale. But you’ll never convince anyone of that if you come at them with your unnecessarily hostile attitude. It’s people like you who chase people away from nuclear. You don’t bring any arguments, you demonstrate no knowledge of the subject at hand, just empty sentences and name-calling.