I think the most unique thing was that he did this in different companies, but when it comes to diversity, Larry Page and Sergey Brin did that too. And unlike Elon, they really had a strong computer science background, to be considered real experts there.
Google (search engine), GMail (the email provider), Youtube (buying it but then further developing it, probably similar to Tesla for Elon), Google Chrome (top browser and dethroning Internet Explorer), Google cloud (one of top three cloud services), Google AI (by far the leading AI institution in the world), DeepMind (coolest AI institution in the world, though Google just bought and funded it), Waymo (leading autonomous driving company), Calico (one of the leading genetics companies) etc etc. Just that they are all under Alphabet, but the likes of Google search engine, GMail, Youtube, chrome, cloud would have been hundred billion companies on their own, as would likely be Google AI. Waymo would not been far off, considering that less developed autonomous driving companies like Argo AI, Cruise or Aurora are worth 10B or more.
And well, e-payments, electric cars and space rockets are different to each other, but so are emails, search engines, AI, autonomous cars or genetics.
Still have to hear people calling Larry Page a polymath.