All the quality control in the world isn't going to save you from cheap engineering.
Here's a picture of the connections to the headlight of a Chinese scooter (Shenke/Jonway YY150T-12). This isn't an assembly fault. It's supposed to be like this.
When you run unsheathed wires directly though a hole in sheet metal (bulb holder) without a grommet or anything to protect them, eventually you're going to wear through the wire insulation, get a short to ground and (hopefully) blow a fuse. Actually I'm not sure there is a fuse in the headlight circuit since it's AC operated directly from the alternator via the regulator, so a short could be bad news. I don't have an accurate wiring diagram to check. All the QC in the world won't save you if it's designed to be that way.
You would not see a design like this on a Vespa or a Honda scooter. To compete with Europe and Japan, Chinese scooters are going to have to be (a) designed better using higher quality components and (b) assembled better with a higher level of QC.