Restarting really is a big deal for me as my workspace consists of several dozen open windows, some of them I have to login, navigate to a particular place, etc... also you lose your train of thought. It has gotten that bad for me, that I have to take screenshots before restarting every time, so I don't lose track of where I was.
I understand not everybody has my same use case but for me it truly is a PITA.
Of course, the alternative is to just click on "Install Later" every 8 hours for the rest of your life, and then the one time you miss that button for a few pixels and click on "Install Now" everything gets closed and obliterated in an instant. But yeah, at least now I have the latest version of Safari which I haven't used in 10 years.