Hang tight just a second -- let me preface all of this with a quick reminder that I'm speaking on a personal level, and I'm absolutely certain that slates have a place in this world somewhere. We could go back and forth for hours with use-case scenarios (and the same could be done with cars, time machines or your luxury good of choice), but this isn't about proving that a tablet can do one or two things; it's about the limitations and awkwardness of using one that no one seems to talk about.
After years of watching the masses fawn over the iPad (and every other PC maker scramble to come out with something that serves a similar purpose), I still can't ever imagine myself investing in one, let alone actually using one in place of a sma