It's a very well known historical story though.

Watching a movie about WWII "I wonder who won??"

That would be like, being in line for a film about Helen Keller and mentioning she is blind and deaf. Like. Yeah. She is. You should know that, regardless of the film.

That's like watching a World War 2 movie and "spoiling" the fact that Germany lost.

If you don't know the story of the Titanic idk what to tell you.

Truth be told, I started watching Once Upon a Time In Hollywood having zero context of what the hell the story is meant to actually be about until half way when someone told me, and it vastly improved the movie.

Like, the woman just looked like a useless character you know. And would keep looking so.