Problem is that most employers are hiring for something very specific, something they haven't put on paper or maybe even deliberately decided in their head. It's not "we need a Java developer," it's "I need someone who somehow reminds me of that great guy I knew at my last job, even though it's unrelated to job performance."

edit to add:

You can interview the same way at 5 different places and get 5 extremely different responses based on the various personalities involved. You can't even go for "finding the strategy that works most often." If 4 places hate you and 1 place loves you, that sounds like an 80% rejection rate, but, like finding a buyer for your house or a partner in romance, you only need 1 person to love you. That's a success. It's a better result than having 2 places hate you and 3 places feeling lukewarm about you.