Spoiler
Oh, my bad. Apparently I confused with "should be POC" with "is canon POC" (though that doesn't erase Benedict's previous strikes), I just remember reading upon an article that described him as Asian I think and it contained a fan that identified with this who had also viewed him as such (I forgot the exact country). If I stumble upon it again I'll link it here, sadly I always browse incognito in Google Chrome so I have no web history. It sucks that I always only remember snippets of things I read, but I must admit I never checked the reliability of the source, but I recall this fan message was what convinced me most. You can dismiss this whole thing if you want to since I can't exactly back it up.
However, I still stand by "racially incorrect" as the Ancient One is definitely supposed to be Asian (love the actress though, once again, don't get me wrong). Then again, it could be frowned upon it bothers me more when an ethnicy is swapped around rather than gender also, since The Ancient One is supposed to be male. Although I can't really say "bothers me," because it's more of a thing that makes me raise an eyebrow rather than being bothered. The thing with the Ancient One is just that she's in this Asian space and it really feels out of place, or is just that me? Oh, doesn't matter anyway.
But don't let the above get the overhand of my opinion though; I did really like the movie, have no beef with the actors and their acting skills, and I'd happily see the movie a few more times.
That is why I put the above under a spoiler tag. I felt like that subject took too much overhand while it's only a small section of what I think. I am sorry if anyone took offense to it in any way.