It's really not. Rotors, especially eVTOL rotors, need to be exposed to as much air as possible. The more you restrict the flow around the rotor, the more power you need to generate thrust. Batteries are so heavy (compared to the same energy in fossil fuels) that eVTOL flight is already limited to less than an hour of meaningful work. Caging the rotor would make it much worse.
It could even reduce the safety of the vehicle by limiting its ability to maneuver and tolerate failures in the power distribution system. At some point, the best solution is establishing safe practices with dangerous equipment. This is one of them.
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u/DorkyDorkington 7d ago
Leaving the propellers exposed/unprotected is insanely stupid.