Agree. Another complication when choosing / assessing the characteristics of rock shoes, at least for me, is my willingness to vary the size I buy to compensate for a model being high / low volume (especially with lace-ups - as I figure I can adjust the lacing).
I'll be off climbing today with a pair of Dragons and a pair of Geniuses, supposedly very low and high volume respectively but my perception of their fit is the complete opposite as the Dragons are fractionally bigger relative to my true foot size (i.e. ignoring each brands own interpretation of the sizing scale) - as they were purchased on a day when my patience for pain had worn thin (my previous pair of Dragons were a half size smaller and indeed felt very low volume!).
You don't really get that with other footwear. In my experience people nearly always stick to their "street shoe" size for say, walking boots, and if a model feels loose / tight will dismiss it as unsuited to their feet, and move on to a different model, rather than try the "wrong" size.
To be honest whilst I love a good infographic these seem a little redundant, as anyone who used one as the sole (sorry) basis of a shoe purchase is deluded.