If the goal of school is to develop children into young adults with good reasoning and analytical skills, a basic wholesome world and social model and some practical skills and basic physique, smartphones seem to contribute little and distract a lot from those aims.
Is that the aim of schools? It certainly did not appear to me that way, here in Germany. There was a lot of time spend sitting in a room and "learning", yet I basically learned nothing. For the other things you described I do not think they were ever considered. All around school was a giant waste of time.
Do you think that was because their methods were bad, you didn't bother and they couldn't force you, or that their methods were not adapted to the way you learn?
Also, I'd find it surprising if you really learned nothing. From what I know of German schooling from people who went through it, you certainly learned at least a bit about the depths to which humans can go to and how to prevent them (Holocaust and wider Nazi atrocities). Also, you probably learned social skills, basic project management and collaboration, and some knowledge which is probably useless other than maybe as a basis of understanding the world and various things you might encounter. I don't recall much from my biology or chemistry classes, but I recall vague outlines, which is enough.