Again, nobody is talking about going back to a stylus for primary input. We're talking about supporting more than one kind of input.
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A pen is an ADDITIONAL means of input. Just like voice input. Or using a physical volume control. Or using the earbud switch to change tracks.
People are used to pens and pencils for drawing and taking notes, not just using fingerpaint. That's why even poor stylii are one of the most popular iPad accessories, even sold in Apple stores.
Adding higher resolution active pen input, alongside capacitive finger input, makes a lot of sense and is part of a trend towards accepting more of the ways humans are used to interacting with each other... finger touch, pen touch, brush touch, air gestures, voice, even facial expressions.
Humans do not use just one form of input or output. Neither should our devices.
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Frankly, this debate is a boring repeat of every other debate about something that Apple does not natively support yet.