I'm not a breeder, but I have a couple of bitches that I show.
I have a few friends, with a different breed, that have been to Westminster. I've never gotten the impression from any of them that it is the
goal to get to the Garden. It's a big show, it's prestigious, it would be great to get a win there, sure. But not the goal of their breeding programs...
Since you brought up Westminster, I looked to see who some of the invitees are.
Capi (of course - the National winner, and #1 GSD )
Margarita Rose (she is a Dallas daughter, ranked in the top 5).
And Galaxy (who is the full brother of my champion's dam's, also ranked in the top 5).
More useless trivia - the judge who is judging the Herding Group for this year's Westminster show, gave my girl Winners and Best of Breed a few months ago. I think I'm kind of partial to him, LOL.