If somebody else admins your system. However if not there is a lot to learn. At least every distribution I've used needs manual updates from time to time. (though admittedly most people would replace the computer before I've seen anything hard happen)
Why would it need someone else to "admin" it?
Who currently "admins" your Windows system?
How much time do you need to take to learn "click on the swirly orange thing for Internet"? It looks just the same as it does in every other OS.
> (which is a sunk cost on windows: already paid it)
This is actually something I'm coping with at the moment, because I have to learn how to use Windows and it's the most backwards thing ever to use.