Even with just what the advertisements inform you, drones crash all the time. A very good drone will consider an unplanned descent and floor interface (aka: a crash) in stride, without the need of detrimental the body. It may also include things like shields to protect the rotors and electronics https://www.aeroindustrial.com/product/czi-lp35-altavoz-y-reflector-matrice-350rtk/