I'm not sure how you can make that claim when the development pipeline for many of these technologies (like the timer chip and pencil) have taken years to come through. I've been watching the pencil patents for around 3 years now, had no clue it was going to be for the Pro.
That's because it's very likely that their leaders weren't 100% sure it would be for the Pro either.
Engineering isn't some absolute decision making process. Most engineering projects have a decision making tree and reevaluate scope at different phases of production to assess direction. We will never actually know:
1) Was the iPad Pro the original planned product 3 years ago when pencil patents were being licensed.
2) If there was an original plan that was different, and what that plan was.
What they knew, was that they were going to want to use the pencil, and they needed to engineer it so they made the patents for it. When iPad sales dropped, they knew they had to do "something", so the Pro started to make sense. And there needs to be an incentive for users to buy the Pro and not an Air 2 with a Pencil, so right now the Pencil and Keyboard are Pro exclusives.
The issue is that there's millions of revenue in Professional users and those users use the Surface because it has the Pen and because you can't run a corporation using presentations on a device that is best used for Candy Crush and Hearthstone. If you want to win over corporate volume purchases from the likes of Surface and Dell Venue Pro's (which not only buy devices, but also large amounts of professional grade software to equip their professionals), you need to have a stylus and a first party keyboard that can be attached to the device.
They got that part right, but shot themselves in the foot by making it a mobile OS. They assumed that Microsoft failed with their ARM based OS because it was Windows and everyone hates Windows Mobile, and that they wouldn't fail with that same premise because iOS is much more successful than Windows RT. However, what they failed to realize is that you need developers to embrace your platform in different segments, or else there won't be third party software to support your high barrier of entry pricing model. Just look at Nintendo and Sega. They had, for all intents and purposes, the much better hardware platform and an earlier jump on the market with the Dreamcast and the GameCube. But they didn't have the developers on their side. Sony did, and that's why the Playstation 2 put Sega out of the hardware business and why the 360 had such a massive turnaround midway through its life.