Yes, it's wrong to be closed minded and exclusionary but there is also a difference between how Herman Cornejo and Marcelo Gomes look in a role. They don't look the same. It doesn't mean the same thing when they dance. They aren't appropriate for the same parts.
I don't disagree. What I object to is critics taking refuge in "standards" that they don't do enough work to articulate or contextualize. Your brief comment above, Leigh, said reams more than most critics do, including Gray: you gave reasons why a certain dancer's proportions matter without recoursing to uncritical, "timeless" notions of "purity" or "perfection."