The argument is that a better user experience was abandoned in favor of a worse user experience that generated more impressions per user.
The argument is that an experience that Dustin Curtis liked better was a better experience. Maybe the victorious layout really was liked by more people, just as more people clearly like a 4" (or greater) smartphone screen than 3.5".
The argument is that an experience that Dustin Curtis liked better was a better experience. Maybe the victorious layout really was liked by more people, just as more people clearly like a 4" (or greater) smartphone screen than 3.5".