Understood. The solution for me has simply been fast app switching. It’s not as fast, as screen-swiping on OS X (or having two documents open at the same time, of course), but the four-finger gestures for iOS work pretty well. Hopefully future iOS versions will address this further.
As previously noted, I’m very close to being able to go with the iPad as my main computing device. Yes, as someone who writes quite a bit (both email and posts like this one), I prefer a physical keyboard — but I found one for the iPad that I quite love: the Logitech variety.1 So there must be something else holding me back.
One thing is specialized VPN access to certain things I need for work. But I suspect that sooner rather than later, that will be resolved. So what else holds me back? Well, habit.
While the physical keyboard aspect gets most of the attention2, I actually believe the tendencies many of us have formed using PCs these past 20 to 30 years are just as important when considering what is holding us back from entering the tablet-only world.