Reborn is already a generation behind and soon it will be two gens behind. IMC quality control may not be that good, but it is not the case with every car. When they produce thousands of the cars every month and a dozen of them have some minor defects (repairable under warranty off course), so it is pretty normal.
And in the case of an assembler/manufacturer just making a few hundred cars, even if one car has defect imagine the ratio.