I'm always amused reading about how usable or unusable devices are.
Let's go through:
Tablets, by design, are devices which should not require a lot of typing.
They are sleek, small and light and a quite long battery life.
They target the mostly the communication market. They sit at the client side of communication where you don't need CPU power.
The same applies for smartphones, except that they are almost wearable.
Smartphones are always with you. You don't have to seek for them, you simply get it out of your pocket.
The display is big enough to look a video but too small to browse comfortably.
Netbooks are for me "tablets with keyboard" as they use the same low powered CPU.
They are pretty cheap and targets mostly the consumer market.
The problem with the netbooks is that they are delivered with Windows and people see them as "a small notebooks" and expected to be able to use Adobe Premiere on them...
As the manufacturer realised that, they popped out the ultrabooks.
Sleek and small as netbooks but with high powered CPU and GPU, so actually "tablets on steroids with keyboard".
They are pretty expensive and I see one market: as dockable desktop replacement.
You work with monitor, keyboard and mouse but you can just undock it and walk away.
Then there is the Microsoft Surface. Not the RT (which is a classical tablet), I'm talking about the Pro. That's special...
It's high powered as an ultrabook but has no docking capabilities, it has the size of a tablet but not the battery life.
I still wonder for which market this device is made for...
They all have their market niche (beside the Surface-Pro) as they also have advantages and disadvantages.
I don't need my tablet to be able to run Adobe Premiere, for the simple reason that I don't want to cut a movie on a tablet. I wouldn't even do that on a notebook !
For this I want a big screen and a powerful CPU.
I also don't want to stand up and walk to my workstation to read my mails.
I grab my tablet, sit on the balcony and go through my mails. I need neither a big screen nor a bit-cruncher for that.
So unless some chip manufacturer will produce 12 core CPUs that can run on battery for 8 hours, tablets will remain what they are: a portable compromise.