I think they weren't satisfied no one would be upgrading
No, they weren't satisfied of the performance.
You do realize almost no one will upgrade because of this? And that it's better for Apple's iPad business to make the best iPads they can so that more people replace their laptops with iPads.
They did not do it to force people to upgrade. Not because they are super-caring, but because it wouldn't be in their interest in the long run. Also, they do take pride in their work. They want to make great products. If they say they wanted to put this feature on other iPads and they weren't satisfied with it - I believe them. Because it makes sense.