Oh, right I misunderstood.
So no, we don't agree on that then.
Renewables and related tech is more than capable of powering a modern civilization. In fact it's better at doing that than any other option, including a nuclear heavy mix.
Ironically, the bits that I'm most fuzzy about renewables working well for (because they're not the low hanging fruit that we can immediately do) would also need to be done to move to a mostly nuclear powered civilization since it's basically about electrification of fossil-carbon-based process.
You don't hear much talk about it because absolutely no-one, especially the people who bang on about it on internet forums, thinks there's any chance at all of nuclear being a potential replacement for all fossil fuels, so it would be a waste of time to even draw up such plans.
Luckily, you can just take all the renewable plans drawn up by the actual governments for their actual plans and then just scale up the nuclear element and scale down the renewables to get some idea if it would work.
And it would work, at much greater cost in money, carbon, time and blood than doing it with renewables.
Which people seem to know on some level, but argue about trivialities and gotchas as if they didn't.
If you have any specific concern about what renewables can't do, I'll happily provide some sources to show why you're misinformed, and why a heavily nuclear grid will hit the same issues at a greater cost.