I do limit "renewables" to only solar and wind in this context. I mean, of course Hydropower is very renewable, but it is mostly already built out, and in the context of replacing fossil fuels and "saving the planet" from global warming, it will have no substantive role to play.

Hydropower is also an example of one of my points. It is a mature technology, and we now know of its big environmental costs as well as it's benefits. We could technically probably double the hydroelectric power of the world, but the natural devastation would be too large, so we mostly chose not to.

We have yet to see what those downside are for solar and wind. For nuclear we know, and also know how to handle them.