re: 8 Things Tablets Still Can't Do
Yep, the big problems on a tablet are screen realestate (which, as you noted is also a problem for laptops). It's basically a tradeoff that there is no way around unless you have incredibly good eyes (the iPad3 has more rez than your desktop most likely).
The other problem, similar to the lack of workspace, is working between two applications with data. For example, write a document where you have to do a bunch of calculation with a calculator. On a tablet, it's rough, on a desktop, no problem. There are a few solutions, but this is overall, an efficiency killer in the tablet world. But again, there are some fairly substantial efficiency/convenience gains that many (including myself) are willing to trade for that when mobile (such as battery life, portability, easy of getting to a task much more quickly, etc.).