Not saying Apple will never put a digitizer on the iPad. And agree that resting on laurels isn't good. But the next big thing for Apple doesn't necessarily have to be a digitizer. There could be other things they are planning on. Just because YOU think putting in a digitizer should be the next thing, doesn't mean that Apple will necessarily see it that way.
Im not saying it is the next big thing. But clearly Apple is positioning the iPad more and more as a mature platform - also for professional work. I dont see why the handwriting and drawing experience shouldnt be drastically improved if Apple can do it rather easily.
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What about Phablets the size of the Note?
Its uncertain whether the Note sells well because of itself or because of the digitizer. Also how many people use the digitizer for anything more than can be accomplished with an iPad stylus?
HTC ONE MAX Lumia 1520, Sony Z1 Ultra, just 3 that came to my mind without thinking.
Your argumentation is double standard. No one can prove that people buy the Note because of the digitizer. However the digitizer is marketed as one of the key features if not
the key feature of this device.
One can be pretty sure that Samsung has tons of data who buys their product and why they buy their product. If the digitizer was a neglible selling point Samsung would have not expanded the note product line with tablets of several sizes.
Also I know for sure that at least in the creative community the wish for a true digitizer for the iPad is definitely there. Also there are
tons of Apps that are created for stylus input (Paper, Penultimate, etc.) and handwriting recognition.