INDIANAPOLIS — It seems about every 20 years, BMW gets radical with the 7-Series. Remember back a couple of decades to the 2003 model that debuted the iDrive infotainment system and “Bangle butt” raised trunklid, named for former BMW design chief, Chris Bangle. Eventually, though, BMW’s competitors copied the car’s controls and rump. As BMW configures the 7-Series for an electric future, it gives a radical makeover that nods to the past and future in the 2023 760i xDrive.