Obviously there’s a small handful of things that would require a reboot, but unlike Windows, the vast majority of programs in user space don’t require reboots on update.
There’s also the fact that restarting Windows to update is a much slower and more disruptive experience than restarting Linux.
It’s speed, but it’s also flow and a continuous stream of thought. If all your editing is being done with muscle memory and minimal thought, you can continue thinking about the problem at hand rather than interrupting your thoughts process to fumble through some context menu to make a change.