I think there's a difference between what you're saying (doing it right is possible) and what the critics are saying (doing it wrong needs to be impossible). There's nothing that best practices can do to prevent a motivated novice from throwing together a minimum effort contract that "works" by whatever test criteria they thought up over the past five minutes.

Imagine surfing the web, but instead of showing a 500 error a broken page would withdraw a random sum from your checking account. It doesn't matter how good the best pages are, no one in their right mind would ever open a browser.