Well, as you've brought this up in the Members community, your feedback will be used to improve products in the future!
But in terms of the "here-and-now", you're right, it's really odd. Ultra should mean "the best" - the Ultra model should get the special accessories. I'm wondering if it's something to do with not being able to get the S-Pen to work with it, but they've managed it on the LED view cover, so I wouldn't think there's too much of a difference. Maybe I'm missing something 🙂