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In practical terms the GP poster is wrong. If you consider an internal combustion engine to be a single unit, an ICE-powered vehicle is of equivalent complexity to a battery electric vehicle. They both need body, suspension, steering, seats, etc. etc. The “ice-ness” adds effectively nothing to the build complexity from the overall vehicle builder’s standpoint.

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You're forgetting the various fluids : oil, coolant and associated tubing, filtering and pumps, the radiator and fan, the starter/alternator, the gearbox, the transmission, the air filter, various belts ... Quite a bit more complex than the electrical alternative.

I'm not arguing that the internals of an ICE motor aren't more complex. From the vehicle builder's perspective, though:

- The oil lubrication system, starter/alternator, various belts, and gearbox (if front wheel drive) are typically part of the engine package so don't really impact complexity.

- Liquid cooling is required for EVs if they're going to perform equivalently to a modern ICE car.

- EVs contain high voltage / high current wiring that needs to be considered carefully in terms of crash safety.

I'm not against EVs here, I think they're great. But if you want more than the old "drop a forklift motor and some batteries into a donor car" DIY build, an EV isn't actually that much simpler to assemble.

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