For most applications you don’t need variable pitch blades on a quadcopter, they’re also very delicate and break easily on drones. I used to fly r/c helicopter

For most applications you don’t need variable pitch blades on a quadcopter, they’re also very delicate and break easily on drones. I used to fly r/c helicopters before drones became popular. The pitch mechanism was routinely a source of problems for me. It’s pretty amazing to watch it work though.