What if The Batman Movies Were Rated R

For an MPAA "R" rating in the US, they probably would have had blood and gore, and/or nudity.
Even as-is, TDK generated some controversy because of the brutality. In some countries, it got the most restrictive rating possible.

Would like to have seen a R rated interrogation scene.

I'm a big fan of a bunch of Batman films already. I feel like Batman, Batman Returns, Mask of the Phantasm, Batman Begins, and The Dark Knight all accomplished what they set out to do. They're pretty top-notch. I can't think of anything that the filmmakers could have done which would have earned an R rating and that might have made the movies better.

Logan and Deadpool earned R ratings and were worth it. Would watching the Joker get much more sadistic be any better? I doubt it.