It would require some sort of longer-term data gathering around the rejection / ghosting process.
For example, Google claims to be very objective and data-driven about their hiring process, but once a candidate is rejected there is no further data.
How would one solve such a problem?
If we agree that it's just window dressing around a "song and dance" (I prefer to call it "the rituals of gate keeping"), there is no problem to be solved.
But I still feel like giving in to cynicism is the wrong answer.