Okay. Here's the conundrum. Fingers are obviously the end all be all of tablet interaction per the Word of Steve, the fact the iPad doesn't have a built in digitizer yet, and always factual subjective opinion. But some people need a fine point to write notes, draw, and do all that other stuff.
So what do you do? What could Apple give us that's an elegant combination of both? The on-hand ever-readiness of your fingers, with the precision of a stylus?
...I believe I have the answer.
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In a designers & artist view, a stylus has much more precision than a finger tip ever can. Unless you have the skinniest fingers in the world.
You can't look at the whole Apple market when you talk of a stylus. Even the article says "Optional". It's clearly meant for piece of the market which includes artists, designers and more.
Go buy a digital draw board, open photoshop and don't use the stylus to create something that is perfect with every pixel, is it possible? No.
A stylus opens a ocean of possibilities for designers and artist all over the world. It could mean finally a full version of Photoshop, Illustrator on the iPad. As well as other pro apps. And Apple love their designers & artist customers.
EDIT: AND considering the iPhone 6s is rumoured to feature the pressure sensitive touch screen, the iPad Pro will surely be shipped with it too, which would make sense considering it could mean the difference of light drawing and hard drawing. Just like digital draw boards.