As an actor m'self, albeit one who performs exclusively on stage rather than film (and certainly not Hollywood film, which I know is a separate monster and one that I'd honestly rather not make myself familiar with) I will affirm Monkey King's statements here. On pretty much every level, insisting on complete accuracy in regards to casting hurts underepresented actors rather than helping them. Maybe this is my own perspective interfering with my judgement here, but as far as I understand it, the overall goal is that as many actors as possible have as many opportunities as possible. Many of the actors I've worked with personally (refraining from specifics) are of such diverse and varied backgrounds, that, as far as contemporary American theatre goes, they'd MAYBE have a bare handful of roles they'd be able to "accurately" portray, or, in the case of those of mixed backgrounds, none at all. But, because of that same uniqueness, they can convincingly portray pretty much any ethnicity. And honestly, that's fantastic, because they're outright good enough that the local theatrical community would be at a loss if they couldn't cast them as freely as they do.
I mean, to use a popular example, could you imagine what an absolute shitshow Hamilton would have been, if all the roles had to be "accurately" cast? Just saying, there's a pretty big reason why we mostly know Lin-Manuel Miranda for roles that he wrote for himself. Honestly, I don't see how the principle isn't the same here. The main issue with representation going on right now isn't so much that roles are given to actors that don't match the exact perfect nationality of the characters they play, it's that the roles that are given severely fail to reflect the actual diversity of the United States. The real painful thing is, this can EASILY be changed… but, because people tend to be dumb about these things, it probably won't. Another good reason why I try to stay willfully unaware of the goings of the film industry.
Then again, this is purely an American issue as well, that shouldn't be forgotten. It shows my own ignorance, that I have no idea what the situation is in the theatre/film communities outside my own culture. But now that it's come to my attention, I very much would like to look into it.
Although, now that Monkey King has brought it up, I would absolutely love to see more starring roles written specifically for the barely-talked about ethnic backgrounds he mentioned. Would there be enough of a talent pool though, to justify it? I wonder…
EDIT: Just realized that the conversation I replied to had died out a lot longer ago than I had thought. Always check the dates of posts before you reply to them, kiddos!