Who is it out there that is so obsessed with thinness that a few milimeters is a purchase consideration, and why?
Consumers are not only driven by specifications that are relevant in a practical sense. To some (many, really) having The Best matters, especially if it calls for significant expenditure to get it, as being The Best is partial justification for the price tag.
That sometimes leads to splitting of hairs as to what qualifies as Best.