Nuclear doesn’t reduce the difference between supply and demand.
How does it not?
There’s a certain “base load” to any power grid which could easily be done by “inflexible” nuclear powerplants.
Sodium doesn’t address the problem with EV weight.
Inefficiency is fine if you have an abundance of energy.
Running a country exclusively on renewables comes with its own costs in storage and emergency solutions.
I’m not saying “go exclusively nuclear” either. Supplementing it with renewables should be done.