The arm rests on older Versas is in fact a known issue. I don't know if they ever did a full TSB on it, but I've replaced or repaired lots of them.
Nissan doesn't make the accessories. They barely make half the parts for the car. The 'OE' bug deflector you got was probably never touched by a nissan employee. This is the state of the industry, and yes, it is kinda sad. It does sometimes amuse me to see who makes some of the parts, though. Titan has a Delphi BCM and Visteon Headlamps. That is GM and Ford, or rather was till they were 'spun-off'. Cracks me up.
SCOPE Senior Specialist, DFRT and EV. ASE Master Technician.