I suspect even the small design detail ...like adding a couple of USB points , entails a plethora (great word plethora!) of design drawing changes, a schedule point on the assembly timeline, supplier contracts, guaranteed manufacturing quality (don't want short circuits causing fires.....). It all adds up to additional cost if it's not part of a standard 'package' for a defined trim level.... this is mere speculation of course!? Which is why I declined said option until I work out exactly what's needed for my vehicle....
