Renewables have been incredibly effective at providing more capacity at good cost, but they still have drawbacks. Aside from the obvious variability everyone harps on, location does play a nontrivial role. Switzerland is not as good a candidate for solar or wind as many other countries due to constraints in usable land and availability (valleys have more shade than steppes for instance). I don’t think anyone needs to be saying no to renewables when they consider investing in nuclear. The two technologies serve very different purposes in an electric grid. Base load is still a problem even with battery storage, and it makes a lot of sense to have reliable power available that is not from fossil fuels to deal with that demand. There is plenty of fossil fuel based generation to replace, it doesn’t have to all be nuclear or renewables, in fact all one or the other doesn’t make much sense.

It’s true nuclear is expensive. It’s also true a lot of that expense was the regulation that has made it so incredibly safe. It’s unlikely a cheaper but still safe enough compromise will be reached in countries with existing regulatory structures quickly, but there is certainly room to improve over time.

The Gordian Knot and Jack Devanney's website is a goldmine of information which will address almost any question anybody has on the subject.