How come people don't consider ebooks as competitors to the tablets? I had a first generation iPad, and I did use it a lot. Then I got a notebook computer to r

How come people don't consider ebooks as competitors to the tablets? I had a first generation iPad, and I did use it a lot. Then I got a notebook computer to replace my desktop, and started using that more. I pretty much only used my iPad while commuting, and then made an impulse purchase and got a Kindle. I find I use my Kindle all the time, and haven't touched the iPad for over a year now. As a device that sits between a phone and a notebook/desktop, I think ebook readers are viable competition to tablets