I would expect eVTOLs to be capable of greater redundancy than a helicopter or fixed wing aircraft - with no single point of failure that could make them drop from the sky. It would add little weight to have two or more independent electrical and motor systems each capable of making a semi controlled landing on its own, but must coordinate to provide the full rated lift. Marketing materials claim the Blackfly has triple redundancy. I suppose one could have software logic glitches that cause all modular systems to respond inappropriately to conditions in unison.