In the long view, tablets came to market too quickly for comic book producers to respond to the smartphone platform in any meaningful way. (4thletter.net)
For this reason, comic book producers / innovators lacked incentive to rethink how comic books are produced. (4thletter.net)
I have heard several stories about Kindle book producers who had their book bounced by Amazon because it was not produced with Amazon's tools. (bergsland.org)