I think price is a huge factor as well if DJI was charging 30 or 40$ per pair I can see taking a chance with cheaper alternatives. Since DJI branded propellers are not that expensive and last long as long as you don’t crash it is a good investment. Would you put cheap summer tires to use in snow on your vehicle? Everything from flight to video quality to longevity of the motors rely on good set of propellers save few bucks now and pay more in the long term.