I love old movies, especially around the 50's-70's, but I'll admit that you're not gonna see a whole lot of diversity in that era. I'm not meaning to moralize. It's just hard to find movies that say, have an Asian character that isn't a horrible racist caricature.
Awe yes diversity. Can't go a day with out reading this ever lasting buzzword.
Is that really your determining factor while deciding to watch a movie? It isn't mine. I watch a movie because its a good movie, I don't go searching for diversity, I like watching a movie because of its entertainment value. You should try it.
Forced diversity is one of the big issues with modern media. Instead of making an actually diverse character, yano, with human thoughts and feelings, they just tick some skin and gender boxes and leave it at that. It's just another form of stereotyping.