that's not the whole issue. How many good actresses that are part asian but mostly look white got passed over for an actress that is 100% white. That is the problem. And every time that happens it reinforces people getting shut out of roles, because it happens enough I don't think it can all just be about looks.
It is well known Asians in Hollywood are repeatedly not hired for these roles, so some people are more worried about that versus what someone who is mixed looks like, if that was the issue I could care less myself, my issue is why repeatedly qualified actors with that heritage do not get the roles in favor of white people and all kinds of people defend it just based on what a mixed person looks like.
But make Johnny Storm black and the Internet rages for months, even though he is a fictional character who's ethnic heritage has never been a plot point, and is white soley because he was created in the 60's.