Because all those nice-to-haves and conveniences in vehicles make it harder and more costly to repair.

Today a classmate showed me the mechanism for the gas door opener her company manufactures (assembles). It’s a bunch of rods, a motor, a control board, springs, cables, etc, that run throughout the vehicle.

The fuel door on my '99 Cherokee?
A hinge and a spring.

This is obviously one small example but i feel that this example of over-engineering for very little benefit extrapolates well.