Good point, but why label those as "attempts"? A decade ago PDAs were pretty good devices with decent amount of free apps and an interesting range of possibilities. (For one, they were extensible via cards. Something that's not available in today smartphones I know of.) You could read books, play games, use internet via WiFi, plus there was a lot of business applications for them. Heck, my old Asus MyPal has better book reader and calendar apps than I have on my current smartphone.

Sure, there wasn't a marketing hysteria around PDAs, but they were a viable market of their own.

Tablet laptops were used by many people as well.