Are we looking at the same graphs? Even going by the weekly one you are vairing by 2x between weeks, that is not stable generation by any serious measure. The grid needs have supply following demand with a tolerance of a percent or two not 50% difference, half a week of EU total energy demand is an insane amount of storage needed that would cost trillions of euros.

E: and if you look at 2022 its worse with a two week period in nov/dec getting down to just over 1/3rd of peak, you would need to have enough storage to cover this eventuality.

I wouldn't go that far, but it's fair to say that small nuclear is unproven, both in terms of operational reliability and safety, and also in terms of its economic viability. The economic viability of large nuclear generation plants is also questionable, once you remove all the explicit and implicit subsidies that have kept the industry alive since its start.

WE CAN DO BOTH!

The future of our energy generation is not a zero sum game, we can simultaneously build out and continuing developing solar, wind, mass storage, and other already proving things while also continuing development on SMR and building large nuclear reactors too. Sure, the nuclear options will take longer to bear fruit but we will likely still be needing more clean energy by the time they do, even with pumping out other renewables as fast as we can.

Do thorough research into grid scale power storage. Then tell me that nuclear is more complex.