Passenger side Temperature control automatically splits so they do not change driver’s temperature setting. Bonus would be to unsplit and return both temps to driver’s setting when no one is in the passenger seat.
When a passenger wants to change their temp, it’s usually just for themselves. It would be nice if the passenger side temp control switches to split mode automatically when touched, so the driver’s temp does not change. To change them both at the same time, use the driver’s side control. This is how Lexus does their split controls, and it’s intuitive once you do it.