I’ve lived in both worlds and there are good and bad on either side of the fence. The biggest hurdle dealers face is parts price. The aftermarket can purchase premium OE equivalent or better parts at considerable less money, they have significantly less overhead, and the ones that train their techs are every bit as good as factory trained techs. It’s a tough battle as for some reason there is an inherent fear you’re going to get it up the hoop at the dealer