I’ll readily admit that I am probably not the target audience for Warren Betty’s Rules Don’t Apply despite that it reminds me of the last film I recall Beatty directing, 1990’s Dick Tracy (which is definitely in my wheelhouse).
This makes sense when you think about it. Dick Tracy was based on a comic strip, so relying on a visual palette dominated by bright primary colors (reds, blues and greens, and contrasts between light and dark so rich that at times it seems that they’re from a Caravaggio painting) adds an element of the fantastical to things, besides making it a bit more similar to the esthetic of the comic.
A toned down, though visually similar palette is apparently being used for Rules Don’t Apply, which also gives it a slightly surreal look.
Which may fit the subject matter, if they’re telling a story that’s also to a degree, a bit unreal.
Otherwise they’re making something that’s based on a real story more visually sumptuous, more unreal than it probably was, which I find frankly a bit irritating.