You’re saying that with hindsight on Steve Jobs full career. You don’t have hindsight on Elon’s.

Is the idea here that Twitter is more complicated than building rockets? Or building factories that build millions of electric cars?

Not the person you're replying to, but it's not "more complicated" per se, technically, but Twitter is as Musk puts it a town square, and if you're going to treat a product that relies on a social network like a car or a rocket...can't see the analogous processes applying here

Yes. The tooling required is more expensive, but the engineering going into both is more mature and simpler.