As much as I enjoy the ASK and is my favorite keyboard, my answer is: No. I don't always use the ASK. If I did, then I would wonder why I didn't simply go with a Macbook.
During the work day, I use the iPP w/ASK. When I return home, I pop off the ASK and put on the SmartCover. It goes from doing "serious" work to become a "leisure" device. Although I have the Pencil, I don't use it as much as I would like because of the lack of a storage solution (to be addressed on Father's Day when I'll receive the Moxiware sleeve)
Although I am very happy with the ASK, I do not use my 12.9" exclusively with it. I tend to go back and forth, even several times within the same session. This is why I really like the ease of attaching and detaching the ASK.