The little-known danger about hidden options that you have to pay to active is that the car already has all the modules and parts to make that work.
While you initially may think of that as a good thing, those parts add complexity and new failure points. As an example: the HID-equipped E39s had self-leveling headlights and the plastic adjusters inside the housings are notorious for getting brittle and breaking inside. Those adjusters are non-serviceable and not sold separately. What about E39s with halogens? They had the same damn adjusters, but doing absolutely nothing in there except breaking too.
Now imagine newer BMWs having the heating elements inside the seats, motors, sensors and adjusters for the headlights, etc. Maybe you don't want any of that and you didn't pay to activate those features, but they will still cause you troubles eventually.
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