.. They correctly surmised that there was no moat with EVs...
This is the only point on which I disagree with you. Otherwise I think you're spot on.
There is substantial competitive advantage in EV technology. No 'moat' because there really is not such a thing. Just ask Kodak!
From cells to battery packs, from Battery Management Systems to motors, from Giga-castings to factory automation...BEV manufacturing, distribution and support are all very different than ICE. Even OTA updates are essential when the technologies are rapidly changing, not so much when they are not.
BEV require charging infrastructure. ICE needed fuel, but John D Rockefeller did that himself.
If there is a modern equivalent in must be Elon Musk.
Not a 'moat' but sustainable competitive advantage. In that, John D is still an excellent example. The companies he formed are still the world's largest ones, a century later. Only the switch to renewable energy and BEV finally threaten their dominance. No 'moat' but he was the one who made the most investment in distribution to match production.
If anything really may resemble a 'moat' it is the simultaneous combination of Superchargers and manufacturing efficiency ('the Alien dreadnaught').
Only John D Rockefeller did that so completely. Thomas Edison and Alexander Graham Bell did that in a country or so. Standard Oil and Tesla 'did do'/'are doing' it in much of the world. Others are learning, but nobody will beat Tesla until regulatory intervention limits their market domination.
Elon Musk is developing seriously analogous characteristics to John D Rockefeller, too.
I welcome argument if you think I'm wrong.