That's not a good explanation because every country can have different cuts of the movie, some containing raunchy content and some not. They already have to do subtitles/dubbing anyway.
Depends on the movie, and it is not always smooth. Also, it leads to higher piracy in countries where cuts are made because people do want the raunchier scenes. Like Oppenheimer had a bunch of cuts in India but it is still doing well, but it is by no means guaranteed.
also consider, the more edits a movie needs, the more expensive it is going to be to produce and distribute