It really doesn't matter what message they show during setup, you haven't worked tech support or computer repair have you?
The non-savvy users rarely pay attention to shit, a message during setup will be nothing but a blip at best in their memory by the time something happens to the computer 2-4 years later.
We've been telling non-savvy users to make sure they backup their shit for literally decades now, they still don't. Not even macOS encrypts the user data partition by default, this is gonna be a shit show and hell desks and computer repair shops everywhere are on the front line.