Its mission doesn’t matter as they usually crash on landings. If exhaust gets sucked back in while making a vertical landing the engine stops producing lift and and it all goes down. This design flaw has always been there.
Doesn’t it’s mission dictate its design? The marines wanted the VSTOL capability which means a more complex aircraft would s needed. More complexity means more opportunities for failure. If the goal is to not have the “highest accident rate”’ then only have one aircraft.