Do you work in tech by chance? I work in an entirely non-technical field (to the point we barely use email), and I have several coworkers whose only “computer” is their phone or a tablet.

I guess the answer is Yes now but I used to work as a philosopher at university until recently. I literally never met a person, both inside and outside of professional settings, who owns a smart phone but doesn't own a computer. (There were, of course, plenty of people in the 1990s who owned neither a mobile phone nor a computer.)

Maybe it's a regional thing? I live in Europe.

A smartphone is the main / only 'computer' for a lot more people than you think.

I know youngsters who dont even have an email address. Though, this may change if they have to enter the workforce.

Lot of people using their office-notebooks at home, even if its not allowed. Most people out of tech do not have big hardware at home anymore.