Dumb cracks knuckles...
Ork tech relies on the low-level psychic gestalt field all orcs across the galaxy generate. Put simply, it's less arrogance that keeps ships working, and more like an absolute refusal to believe things work any other way than how they do. That gun that's literally firing explosive nerf darts? That works because an Ork is firing it, and all the other Orks believe that if an Ork picks something up and starts shooting, then it MUST be deadly.