They certainly shouldn't treat validated leads poorly, but we've seen ample evidence that they often do. Part of the problem may be (I'm less sure about this part) is that it is essentially the same people -- and same organization -- managing the overall hiring process through all stages of the funnel. They start with a shotgun process and they keep using a shotgun process in later stages when they absolutely shouldn't be.
It's better if you've got a prospective hiring manager inside the company that wants to hire you and is keeping an eye on the overall process -- this is what often happens whey you're recruited by employee referral. However, this just isn't an option at places like Google (and I think Facebook and Amazon as well) where you get hired into a global pool rather than hired into a specific team.
But by the time a candidate is past a phone screen that’s a validated lead. A company that was really desperate to hire wouldn’t treat validated leads so poorly. That they do means that they aren’t and we should disregard self-serving claims to the contrary.