Oh boy are you trying to stretch a point!
Utility: Ok, I'll give you that proposal, up to a point. Yes, having the separate keyboard might be an annoyance, but did you need it while you were reading that email? What if, in a later email the sender has done all that work for you? Guess what, now you don't need to go digging for all that extra stuff. But even if not, what are you doing with that data on a thumb drive when your most current data is already right in front of you in that tablet. Don't you know how to cut and paste? Honestly your description went out of its way to make things harder than they should have been.
Security: I'll grant you this one--marginally. Unlike that laptop, if you discover your tablet is stolen you can 'wipe' it from your smart phone--on at least one brand. Not only that, but the tablet can tell you where it is and help you to recover it. That's already happened more than once, to the detriment of the thief.
Windows Tablet: Windows is truly far too much OS for a tablet form factor as evidenced by the fact that Apple sold more tablets in nine months than all Windows tablets combined in ten years. If you ask me, this is more due to a serious lack of 'touch' support from Windows developers than any real lack of capability. Even now Windows Touch is very crude compared to any other touch system. The "Metro" interface is a step in the right direction, but considering the ability to disable Metro, I don't see any serious moves forward in Windows for a few years yet.
Longevity and repurposing: The average life of an enterprise PC is about three years, not 5-6 years. Yes, in a home environment and some corporate uses they may last longer, but that replacement is based more on how often they have to replace them, not how often they want to replace them. A tablet can last just as long when reasonably cared for but I do expect they'll improve far more quickly than the desktop hardware does over the next few years. As far as repurposing? Anything a desktop can do, a tablet can do, as long as you stay within the hardware limits. Tablets are just as re-purposible as desktops or laptops.
Tablets truly are functional productivity devices, within their limits. To ignore a device's potential is to find yourself left behind when that potential becomes reality.
