Actually, he isn't stretching the subject that far at all.
Utility: You mentioned that "What if, in a later email the sender has done all that work for you?" Why would he have bothered you at all with any e-mails if he was going to do the corrections himself? The only reason for him to have sent the e-mail was for you to do the corrections, therefore, you would indeed need to pull out all of the stuff he mentioned. A laptop has everything except for the printer built in already. The laptop gets the vote there.
Windows Tablet: It doesn't matter if it is far too much for a tablet to run because no matter what the business world will always run on Windows. That is just the way it works. It will remain like that until Apple has the good sense to let the bottom fall out on the prices of their products.
Security: My personal laptop has a fingerprint scanner and a webcam built in to identify the user so that unregistered users can't access it. It wouldn't be that difficult for laptop makers to include GPS chips in the laptops so that if it gets stolen or misplaced then you can find it just as easily as that tablet. Onstar already does it with vehicles, so it would make sense that it would be just as easy if not easier to do it with laptops.
