This might depend on one's age/generation. There are tons of internet-connected people today growing up without ever owning (or knowing how to use) a PC at all. They do everything on their phone, including the creative stuff. I didn't believe it either until I saw my friend's high-school age kid writing an entire 15 page writing assignment on her phone. Us PC people are kind of dinosaurs.
I agree with the parent comment. Smartphones (and tablets) are useless for anything productive. They are entirely consumption machines. If somebody is able to do their job or studies entirely on a smartphone and tablet, it says more about their job and studies than anything.
What vexes me to this day is that you still can't really use something like VS Code on an iPad (you can do it in a browser in a limited way). A tablet, with a wireless Bluetooth keyboard would be a perfect hybrid for creative and productive work. I haven't really found a 2-in-1 that provides the same standard.
And many of them face issues when joining the workforce.
Hard to imagine, as for me any text longer that 1-2 sentences is a pain on mobile, but maybe indeed it is a matter of conditioning.