That's a wild statement from someone who has never built a commercial ev. Like all industrial hardware, the portion protecting from what shouldn't happen is twice as complex as the section regarding what should be happening.
There are certainly safety devices that I elided over. For example, checking the battery temperature is pretty crucial.
But, my argument is that EVs aren't complex. I could even grant your 2x number for safety measure and you'd still end up with a much simpler device than you can pull off with a comparable ICE engine.
I'd also point out that a lot of the parts are already "off the shelf".
There's a reason we saw a slew of pop-up BEV manufacturers all at once. It's because the manufacturing complexity is simply a lot lower than it is for an ICE line. There are far fewer parts, far less complex parts, and the parts are more readily available.
