Huh?
On Atomic distros you need to reboot everytime you update the system or install anything into an overlay...
On other systems you can mostly just restart services and programs, as long as they aren't the kernel, and likely pid 1.
(Arguable kexec can be considered a reboot.)
Solar, wind and hydro power is faster and cheaper to build and operate. The only advantage of nuclear is the constant power output. However, we are constantly getting better at efficiently storing energy.