My theory is that noir films became less popular because they always represented the central female as a black widow. With modern feminist ideas you can’t just keep painting females as bad, evil, manipulative, money-grubbing people.
No one is bad unless you’re talking about serial killers and dictators. They’re good people trying to do the right thing, but they mistakenly think the wrong thing is their way forward. I always strive for that empathetic edge for characters. I think it makes for better villains; it makes for a better experience for the audience.