I guess you are right about the misunderstanding. No, it shouldn't be biased but you will get treated differently if you don't dress nice for example, this is very explicit and intentional. We do not have a system where everyone regardless of appearance or other advantages is equal. I don't have a problem with her beauty being an advantage because others also have an advantage in other forms and are allowed to exploit it. Ideally judges and juries should not see or hear the defendant and lawyers should all get paid the same amount regardless of the defendant and everyone should get educated on the law and their rights equally. But the more practical way to acheive justice right now is to accept natural biases caused by beauty or unnatural ones like wealth and compensate those who lack advantages by other means like legal associations that do probono, government funding legal insurance like health insurance (except directly without the middleman) and judges, at the request of the defendant or prosecution educating juries about the bias caused by a persons appearance and warnig them about unintentional bias and many other practical things. I have no problem with her advantage because it isn't her fault and the root cause is not her taking advantage of her appearance.
This is what i mean by requiring a reply for a downvote, to allow the commenter a chance to reply and clarify what they mean.