I think the commenter in your post is right but is forgetting about the outsourced complexity of the big autos. Chassis assembly is only marginally simpler for

I think the commenter in your post is right but is forgetting about the outsourced complexity of the big autos. Chassis assembly is only marginally simpler for an EV vs an ICE since the ICE relies on third party suppliers sending the highly complex parts to the line. The complexity of parts like the engine, transmission, exhaust system, fuel system, etc. is abstracted to the suppliers so that GM or whoever can just bolt it to the final car. Tesla has a big benefit here since if they were designing a brand new ICE, they'd be responsible for all those parts too. It's not that they get the simplicity benefit from not installing an engine, it's that they don't have to wait for the most complex part of a car to be designed, engineered, constructed and delivered.