It might seem like a low cost, but hobby funding for me and probably most people these days is very limited. I would have to choose between buying motors and buying a new tablet or phone. If I buy the device, I won't have motors, so there would be no need for the new device, so what's the point of the new device? I would not use it for anything else but rocketry, or I would already have one.
To me, this is a 'non-starter.' The paper card system isn't broken, doesn't need to be fixed.
P.S. I just checked Amazon, and at $89 - $249 each, Kindle Paperwhite devices are definitely not low cost! That would be most, if not all, of my motor budget for a whole year!