I cannot argue with anything you said. BUT I can expound on it..

However, on a rooster the crest can be pretty darn small.
There is a breeders paradox also, even the non-show person wants birds that would show or could show. I think BYC does some to spread that paradox. We all hear on hear about hatchery quality birds and so many of us complain about them. The only exception I see is people looking for egg color.
Some of us want it all. Nice eggs, good layer flock and a pretty egg basket......
To me the show people/attitude is wrong when it emphasizes a trait that cannot be passed to the show birds offspring. A good show bird should be one that has great traits it can pass to all it's offspring. More like the prize Bull that can bring his size and cuts or milk production to his calves.