A thorough understanding of the Standard is essential, IMO, in breeding better birds. It starts in the selection of your brood stock, but by no means stops there.
One of my dear friends was a Show winner with Silkies more than 20 years ago, Vicki Karesh. She use to take 1 or 2 birds to a show and would be on championship row every time (she's got an attic full of trophies to prove it!). I asked her once how many chicks she'd hatch to get those 1 or 2. Her answer: 'for every bird I show I've hatched 300 chicks!'
Sure, on Show day, it's about the condition of the bird. But, it is also about selection, lots of chicks, and culling. The Standard was written by folks who were interested in the best utility value of the fowl being shown (whether meat, eggs, gameness, or even beauty). A top quality show fowl should be able to do what it was supposed to do: thus, the best of the best. To get that it takes more than mere good genetics of the brood stock.