>NES and early SNES: Censorship galore, glowing crosses in Castlevania 3 are too naughty and Mortal Kombat doesn't get the Genesis blood code
>Late Snes-Wii: Nearly no censorship, get DOOM, Conker's bad fur day, BMXXX, No More Heroes intact
>Wii U and 3DS: Censorship galore, can't even have lingerie costumes in an M rated horror game (Fatal Frame)
>Early switch: Nearly no censorship, games like "Waifu uncovered" get approved for physical copies, Night Trap gets an appearance on a Nintendo console decades after Howard Lincoln tesfified to congress it'd never happen
>Late switch and Switch 2: Censorship galore, and as a "bonus" trannyshit gets inserted into Xenoblade 3 and Paper Mario TTYD
It seems to me like Nintendo only censors when they're doing well and get cocky, and let up when they get desperate for sales again. But of course, this takes time to implement so it's not some instantaneous thing that happens.