Traditionally characters of colour had their ethnicity as part of their character. J Lo broke that mold when she was lead in a movie in which her ethnicity wasn't referenced, she was just herself. It hasn't always been like that though, the 'default' is white characters unless the setting is specifically depicting latinx community, black etc.
The old mold probably doesn't bother you because you are represented. You may feel differently if movies look nothing like your world.
I watched Mary, Queen of Scots and there was a black and Asian Character in the movie. They portrayed characters in royal setting of 16th Century Scotland and England.
I stand corrected, I have now seen Hollywood go overboard on representation.