I’ll be honest, the only reason I originally switched was because I needed to learn flask for a work thing. I didn’t really notice any major differences in performance, but it was a pretty light website at that point anyway. I do prefer flask now, but that might just be because I’ve used it more.
Nuclear power is extremely green when compared to fossil fuel and can act as an excellent stopgap while ramping up renewable energy sources. You’re right that it isn’t a long term solution, but even replacing a few coal fired plants with nuclear ones for the next 30 years would be better than running the coal plants for 20 years until you can displace them with renewables.