I get sent a lot of resumes with pictures, and the bottom line is that while you can’t always tell if a girl is attractive, you certainly can tell if she’s unattractive (obviously I mean this subjectively, i.e., “to me”). If she has naturally pretty features, but they are altered by too much fat, she will likely look less attractive. How is that the guy’s fault? It’s no mitzvah to say yes to a girl that is unattractive just to see if her personality will completely upend the scales.
As an aside, I can pretty much say that any girl of average height under 185 pounds is certainly not too fat for me. This is not a blanket statement, but I thought I could add some specificity to this.