I think all the criticism you've directed at Musk has some validity, but the same rants could have been made about Steve Jobs or Bill Gates. MS was lucky enough to become IBM's choice for OS, and the much hyped Windows 95 essentially just put it on par with the Mac interface.
People obsess over Apple products, but has the iPhone ever been unquestionably superior to other smartphones? The iPad promulgated the tablet's popularity, but I remember Larry Ellison talking about dummy terminals with all one's information stored on a server in the internet more than a decade before. Maybe Musk is more marketer than engineer, but he does seem to be a primary catalyst for technological innovation at a societal level, in perhaps the same way that JFK's goal of a man on the moon, while obviously not providing any technical advances in itself, spurred on a massive technological revolution.