I think this is exactly the right attitude. Some people in marginalized groups feel they have to boycott a film or TV show if it isn't exactly what they wanted. I think that attitude discourages people from making such shows. You can love a show that isn't perfect, and still demand that it be better. This is supposed to be a story that fills a need for POC, so it's a good thing that so many are making their wishes known. I've seen this objection raised in several medium articles, and heard it in conversations, so I'm sure Shonda Rhimes will be responding to this in future shows.

As a highly privileged person, I have never felt the need to see someone on screen who "looks like me". I've never thought that Brad Pitt or Clint Eastwood look like me just because we have somewhat similar skin color. If I never saw another white male in a leading screen role, it wouldn't bother me in the slightest. On the contrary, I usually find stories about marginalized people to be more worth watching, because they have so rarely been told. I know that not all privileged people feel that way. I remember the silly reactions to the Black Annie Movie, the female ghostbusters movie, Black Santa Claus etc. But the ticket sales for Black Panther, Crazy Rich Asians etc. show I'm not alone on this.