Because it artificially reduces the talent pool they're drawing from. They might wind up hiring someone less competent who was better at signalling or making concessions to someone who wasn't as far ahead of the pack as they thought based on interview performance. Time and opportunity cost also factor in, of course.
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I understand how a mistake in an A-list interview hurts you, but how does it hurt the A-list company?
Because it artificially reduces the talent pool they're drawing from. They might wind up hiring someone less competent who was better at signalling or making concessions to someone who wasn't as far ahead of the pack as they thought based on interview performance. Time and opportunity cost also factor in, of course.
Because coming into an interview with your A-list unprepared is a waste of their time.