I don't. That's my point. No one does. He died shortly after. Even to those he told plans to, he never got to see them through. And I haven't heard anyone commenting on private conversations they had with him about it.
I realize my comment came out harsher than I originally intended. I like my iPads too, and they are great for some use cases. I'm typing this on an iPad now.
I remember when it came out, and I remember the absolute panic it sent other companies into trying to either copy it, or otherwise force touch in places it didn't belong. He really shook up the industry and frankly scared the crap out of them.
And then he was gone. And the iPad didn't really advance after that. I think today it has a bit of an identity crisis. Everyone who replied to me rightly points out that it's a "third" device. But Apple doesn't seem content with that. If they truly believed that and embraced it, good.
But they seem to be trying to use it as the future model for locked down software distribution, highly controlled API access, and extremely limited user interfaces.
I don't know what Steve wanted, and I didn't assert that I did. All I said was, look at the iPad, and ask yourself if this is what he meant for it. I don't know. Does it feel right to you? I'm genuinely asking.