Originally Posted by
Zeke
ACMS,
Boeing also allow customization of overhead panels. Switches can be ordered to work in the opposite sense on the same aircraft type because one customer wanted it a different way to another. This is madness for commonality.
Boeing no longer offer customization you get the base model and then order extras like a car eg the HUD on the 787 is standard and not an option. The days of having switches reversed are over, this practice started with the 777, for cost and the reasons you said.