I wonder if Samsung has a patent on limiting the SD to data only. If Apple was so inclined they could use a similar method, locking down the apps to prevent piracy but allowing the users use SD cards for data. I just looked at my iPhone and I use about 1.7GB for apps. My iPad is at home but I suspect it will have quite a bit more but probably still less than 10 Gb in apps.
I wouldn't characterize it as a trap. It is a business strategy that is often successful. Simply fill all the niches so your competitor has no where to go. It works fine until someone comes up with a disruptive device. That's what happened to Nokia when the iPhone came along. Currently with only incremental improvements in smart phones it isn't a bad strategy.
A tablet that can be used as a phone makes a lot of sense in the business world, so I don't think this product will only apeal to lower incomers. If Apple responds I'm sure they will find an innovative way to get past the technical issues that some have posted about.