When a factory (OEM) wheel is made, the primary goal is quality & safety:
Strength from road hazards
1 Durability from road salts, car wash acids, chemicals, etc.
2 Toughness in order to minimize warranty claims and/or recalls.
3 Proper design to support the weight of the vehicle, passengers and cargo with a huge safety margin.
4 Fitment to ensure suspension and braking systems operate as designed and without vibrations.