It's a world-wide competition to generate the most expensive electricity! The record is currently held by Vogtle in Georgia US, but Ontario Canada is trying to take the crown by spending $500B on nuclear.
At a certain point, dollars are funny money if you are destroying the environment to save a few now by generating baseload with a carbon-producing tech.
Of course, let’s build the safest and most efficient nuclear that we can, but “its capex is too high” is not a compelling argument to me.
And to be clear: renewables should form as much of the capacity as possible, but a reliable baseload is obviously still needed.