Well, I put it in quotation marks because I was using it in the sense that I think the parent was using it -- I agree it's too broad a term to really be of use.
I agree with your point -- to an extent. Most of the tasks you list would be greatly helped if a keyboard and mouse could be used in conjunction with the touch screen with a suitably designed OS.
The products that could really compete IMO are ones that are not just copies. A good example is the Lenovo Ideapad tablet. It isn't the same as an iPad, it's more of a cross between an iPad and a netbook. One of the great things about it IMO is that it switches to a special touch OS when you fold it up as a touch screen device, and back to windows when you open out the keyboard -- I think this solves one of the major drawbacks of other tablet PCs.
It is a bit larger than the iPad at 10", but still very compact. To people who like the idea of an iPad, but can't quite justify buying a device that doesn't have a keyboard etc. it could be quite attractive.
Touch screens are fine if all you want to do with a device is browse the internet etc. As soon as you want to type or control a phone or media device they fail miserably. The lack of tactile feedback prevents fast typing, and means you cannot control a device (like change music tracks or reply to a text message) without looking at it. That's a pretty fundamental problem IMO.
I'm all for touch screens, but most devices will always need good old buttons as well. If the industry ignores this, we'll end up with a whole lot of devices with less functionality than current ones.
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