[scottieh]

This is the study I used as the basis of the Thumb Zone, etc.: http://www.uxmatters.com/mt/archives/2013/02/how-do-users-re...?

[nchlswu]

And that's my fault for not following the linked sources in the article.

While I agree wih all your points in your assessment, I'm curious about the point the research mentioned about users changing grips depending on task. Will this be a significant problem? Or would it be an unconscious adaptation.