With technology so old and with so many plants which were built in the past, it should not need a huge political will anymore to be successful. But it is still so expensive that it has simply no chance on the market. In contrast, renewables are now cheap. And this is what Germany achieved with its - certainly substantial - investment.
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The only countries that have achieved economies of scale in nuclear reactor design/build after the 1980s have been France and China. [0]
Other countries built one reactor here or there, while continually shifting regulations and/or political support, and then were surprised it was shockingly expensive.
[0] https://en.m.wikipedia.org/wiki/List_of_nuclear_power_statio... (sort by Began Operation date)
One country should have been enough to create an economy of scale. And yet even France's nuclear industry went almost bank rot from building new reactors despite all the experience from the past.
Unfortunately, scale isn't global given how many of the regulatory limiting factors are country-specific (and even worse, site-specific).
But not even in France it it not cheap and the "regulatory limiting factors" are partially true, but also partially an excuse and not the only factor which makes nuclear expensive.