You explained why some people will prefer ereaders right there. People who read outdoors, or anywhere else that there is direct sunlight, really don't have an alternative. People who do a lot of traveling where they don't have reliable access to electricity don't have many options in the tablet world either. (It basically comes down to reducing usage or carrying portable chargers.)

Of course, there are other factors. Yet I suspect that you'll find that those two reasons are the overriding factors for most of the people who choose ereaders over tablets or phones. Just as eInk has technical limitations that limits its applications, LCD has technical limitations that limits its applications.

For the distractable crowd, of which I'm a member, I will point out that it is possible to created a dedicated LCD based ereader that would be better for many types of publication. Indeed, a technically proficient individual can create a dedicated ereader from virtually any Android device. Those without the requisite technical skills can simply follow instructions created by someone else or even explore the settings on their device to disable many of the features that distract them.