Commercial airplanes are designed with extreme degrees of safety. The FAA requires a one-in-a-billion rate of catastrophic failure.
The engineers achieve this with redundancy. Extra structural material, extra wheels on the landing gear, multiple independent structural load-bearing paths, extra flight-control surfaces and associated hydraulics and auxiliary equipment. Independent left-side and right-side electrical systems. Extra oxygen bottles. Duplicated or triplicated fluid systems. Triple-redundant electrical bonding, sealant application, and fasteners. We blow nitrogen gas into the fuel tank to make sure it can’t explode, even though that shouldn’t be possible in the first place because we systematically eliminate static electricity buildup in the tank to ensure there is no ignition source.
Did you know that every jet you’ve flown on has a RAT on it? A ram air turbine, that is. A heavy windmill power plant that gets hauled around as dead weight and only gets used in an extremely rare emergency, which probably will never occur in the entire multi-decade life of the aircraft.
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All of this makes for an aircraft that is much less efficient than one that works 99.99% of the time. It's pure waste almost always. Extra weight. Extra fuel burn. Extra cost. Extra manufacturing operations. Extra maintenance. Extra pre-flight inspections. Because of this caution, you are paying substantially more for flights than you would otherwise, probably by hundreds of dollars worth.
Yet it's deemed to all be worthwhile because we want the risk of catastrophic failure to be that low. Sometimes the first two systems fail and that third one is what saves everyone on board.
Why not treat Tesla's liquidity with the same degree of caution, considering the tragic consequences of hypothetical failure?