The biggest flaw of the "ass-o-meter" is that it doesn't take into account personal preference and personal comfort. I use a very narrow saddle because I am not comfortable with most of my weight on my ischial tuberosities. I can't ride for 20 miles like this. I would prefer more of my weight on my peroneal area and it doesn't cause me any other problems after 30 years of riding daily. The Specialized saddle based on my "meter reading" is a terrible saddle for me.
Unfortunately, you can't pick a saddle with a ruler.