Some personal thoughts: My own country (The Netherlands) has despite a very vocal anti-nuclear movement in the 20th century completely flipped now to where the only parties not in favor of Nuclear are the Greens, who at times quote the fear as a reason not to do it. As someone who treats climate change as truly existential for our country that lies below projected sea levels, it makes them look unreasonable and not taking the issue seriously. We have limited land too, and a housing crisis on top of it. So land usage is a big pain point for renewables, and even if the land is unused, it is often so close to civilization that it does affect people’s feelings of their surroundings when living near them, which might cause renewables to not make it as far as it could unrestricted. A nuclear reactor takes up fractions of the space, and can be relatively hidden from people.
All the other parties who heavily lean in to combating climate change at least acknowledge nuclear as an option that should (and are) being explored. And even the more climate skeptical parties see nuclear as something they could stand behind. Having broad support for certain actions is also important to actually getting things done. Our two new nuclear powered plants are expected to be running by 2035. Only ten years from now, ahead of our climate goals to be net-zero in 2040.
You can certainly try to use the power as much as possible, or sell the energy to a country with a deficit. But the problem is that you would still need to invest a lot of money to make sure the grid can handle the excess if you build renewables to cover 100% of the grid demand for now and in the future. Centralized fuel sources require much less grid changes because it flows from one place and spreads from there, so infrastructure only needs to be improved close to the source. Renewables as decentralized power sources requires the grid to be strengthened anywhere they are placed, and often that is not practical, both in financial costs and in the engineers it takes to actually do that.
Would it be preferable? Yes. Would it happen before we already need to be fully carbon neutral? Often not.
I’d refer you to my other post about the situation in my country. We have a small warehouse of a few football fields which stores the highest radioactivity of unusable nuclear fuel, and still has more than enough space for centuries. The rest of the fuel is simply re-used until it’s effectively regular waste. The time to build two new nuclear reactors here also costs only about 10 years, not 20.
All of these things should happen regardless of nuclear progress. And they do happen. But again, building renewables isn’t just about the price.