All of those are MORE expensive, at scale. If you can just hand 1500 kids a $200 Chromebook that fulfills ALL those functions, that’s $300k, vs 1500 e-ink readers at $40 a pop, 1500 digital typewriters @ $100 apiece, etc. Hell, that scientific calculator ALONE might be $200+ in some markets because Texas Instruments practically has the market cornered (to the point that I had to go to the administration of my school district to show them that the Casio I had was functionally identical).