[Commentor] LC-309 Ian Jacobs [Working Group decision] The point is less to be measurable and more to provide best practice guidance. We are saying in the explanation below that a discursive style is usually less appropriate in the mobile context. It's an important point and we have kept it. [Commentor reply] yes [Comment] 
I believe that the above checkpoint no longer exists in WCAG 2.0. I have not followed that debate recently, but I believe that it is so contentious as written (and not verifiable in any obvious way in that formulation) that you will regret having included it. I recommend talking to the WCAG WG about the evolution of their thinking in this area.