Form factor was the killer for a lot of old devices as well as the lack of infrastructure etc.
Tablet PCs that were just laptops with flip around screens, were too heavy, bulky, hot and had too short of battery lives to be used like an iPad.
Slate PCs (no keyboard) still tended to be too bulky, short battery lifes etc.--and were crazy expensive.
Tech has finally advanced that we can get thin, light tablets with a decent amount of power that get long battery life and have the form factor to hold and read or mark up documents comfortably etc.
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