I have two nieces that are high school aged and I do not think either has a computer. They use their iPhones for 100% of their activities. As someone who started with an Apple II in my bedroom and has had multiple machines at all times ever since, trying to do anything on a phone feels insane to me, let alone trying to do everything. Yet there are whole generations now that will know nothing but. And I have made older friends who are not incredibly well off, and thus a laptop would be a luxury item, but a phone is a necessity- where I live now, a phone number and Whatsapp are required to get almost anything done. Thus, the priority on the phone.
It very much is a shift to me that makes me feel different; My nieces have only minimal typing skills because of this (although, they can text on a phone quickly, they aren't formatting multipage documents or consistently doing 90-100WPM for hours and end on their phones). They have no understanding of any modern operating systems involving windows or even multitasking. They spend so much time on their phones but I feel they are seeing considerably less of what's out there due to the nature of the device. They can spend hours on TikTok. They would never spend hours with 10 tabs of wikipedia open. Not on a phone.
I know it's weird to think of 'productiveness' when it comes to just, 'being on the internet'.. but when I see young people only ever on a phone, and I think to myself at that age, having multiple monitors, multiple computers at home, all dialed in and reading different webpages, chat windows, PDFs, having docs open at the same time- I feel like that was "speedrunning learning" compared to what they are able to do now on only a 5" phone screen.