I doubt that many people are reading ebooks in a context where they need to copy and paste regularly, I could be wrong though. I read exclusively ebooks and it hasn't ever come up that I remember. I'm not saying it isn't a valid use case, but I question whether it is a common use case for the average user.
I'd be curious to know how someone has narrowed down the black box that is Netflix to determine that buffering is caused by the DRM.