Where does this "need for baseload" energy come from? Baseload is a demand side concern. It can be fulfilled by any number of sources and we already have grids operating with zero baseload.

The grids have dispatchable power. But that is a different concerns.

Point out the "baseload power" in this grid:

https://explore.openelectricity.org.au/energy/sa1/?range=7d&...

You also have to look at it in terms of outcomes. How do we get the most decarbonization the quickest per dollar spent?

Focusing on reducing the area under the curve. Looking at it from that perspective wasting money and opportunity cost on new built nuclear power leads to spending longer time entirely dependent on fossil fuels.