There's more to the cost of a piece hardware installed in a vehicle than just the materials and labor cost that go into the hardware. There's also the development cost to be amortized over the expected production run (which can be significant for small runs), the cost of maintaining separate production lines (if needed), the cost of managing the extra build options, the cost of the extra inventory to support the additional options, the cost of future support, etc.
I can certainly imagine a scenario where the ADB-capable headlamps are close enough in materials and labor cost to a different design with a curve-adaptive function and high beams that can handle the more frequent use and switching that comes from automatic operation that the additional fixed and indirect costs don't support 2 separate designs.
