> Like 80% of the world is smartphone-only

Ok, but you still can't get actual work done on a smartphone with any efficiency.

> In my (wealthy, Boston area) suburb most high school students do all their work - including writing multi-page papers - entirely on their phone. They think laptops are for old people.

Kids are stupid. We were stupid when we were their age too. They will learn eventually that to get serious work done, you need an actual computer.