If you want to talk about the laptop and desktop use case, we can talk about those, but non technical people don't have laptops or desktops anymore, they got thrown out sometime after the iPhone and ipad came out, circa 2010. (sorry you didn't get invited to the conference. It was nice, Sarah brought her granddaughter and we had chips and guacamole, it was all very nice)
I disagree, it's an extremely myopic understanding of the world likely perpetuated by a sheltered Silicon Valley cabal.
There are millions of non-technical people with jobs, where they are issued a company computer.
It's conceivable they might want to access the World Wide Web on it.
Assuming they own no other devices other than a mobile phone as you suggest, they still have at least two and probably don't want to sync anything from their personal phone to a company computer.
P.S. your comment was funnier before you added the part about the gucamole