That airline is biased in favor of pilots with many hours of experience.
Is it possible that a newbie pilot might be safer flying this jet than someone with twenty years of daily flying? Perhaps. But it's not worth the time, the money and the risk to find out. That's why you won't see a new pilot flying the 747 you're boarding. Young pilots have to put in a ton of hours because the airlines are biased.
Everyone has a bias, because that's the only way to survive in a world where we have insufficient information.
Bank security guards are biased against people who walk into the bank wearing a ski mask. It might be because it's cold outside, but it helps them do their job to begin each interaction with this belief.
Engineers are biased for certain suppliers or technologies. Talent bookers are biased for certain skills and demeanors.
The problem kicks in when our bias works against our goals. When our bias keeps us from exploring options that will move us forward, it needs to be replaced. When our bias cripples a society we care about, when it gets in the way of fairness, it must be re-examined.
But it's worth understanding the nuance between the bias that enables us to be successful and the one that keeps us from that very same outcome.
The best professionals are biased. And smart enough to embrace only the biases that keep them successful.