We have to agree that most 140+ are good enough to compete in G1 or G2. However the breeding of a high bsr is purely based on luck as stated and not everyone get lucky whether its hot combo or not. Most of the time it seems there is a minority group of breeders that get those 140+ or decent enough horse to race in a G1 or G2.
A DISPARITY IN THE GAME.
When I look around, I see many trainers get overwhelmed with joy when they breed a low 130 for the first time and yeah why not; its the best horse they ever owned and end up seeing their horse get crushed in a G3. Still they hang on to it; why? But why shouldn't they? Its their highest bsr ever! I bow down in my own thought; I was in their shoes too once upon a time.
So we end up counting on luck. If we get lucky, we will show our competency as a trainer.
Now for a solution, we can get rid of the bsr system and come up with 10-15 solutions that will make the game better for unlucky breeders and it will require very few changes, but who will be willing to change the game for good?