If anything his companies are doing well despite of him, not because of him. There's level-headed and competent leadership in them resisting his bullshit.
The only new western car company in decades to not fail, based on a technology nobody believed in at the time, least of all other car companies
SpaceX being a private space company, which was completely unheard of. No experts though they could succeed
Smaller earlier businesses like Zip2, paypal, etc
These are gigantic high risk companies with high failure probabilities, the chance they they all happened to be successful despite Musk and not at least in part because of him is stretching reasonable doubt for me.
I'm absolutely no fan of his politics or personality, but the man can run a business that nobody else even dares try (at least until he demonstrates viability and the market starts to generate competitors)
Of course it’s still early days for all these companies and they’re not exactly fiscally solid, but if Tesla had not made all those cars, someone else would have.
Three sucesses.
Not so successful: Solar City, Neuralink, TBC, X.
(X exists, but before it was valued-and-bought by one of Musk's other companies, it appeared to have lost about half its value).
Richard Branson he aint.
They put out this video of a patient with ALS regaining the ability to communicate.
Hard to see that not being successful, once it passes the FDA, assuming it's real.
The main problem isn't even the tech, though the tech isn't as good as it seems either.
Their main advance hasn't been the BCI: other teams also do this, main limiting factor is product lifetime rather than electrode count (though yes their count is higher).
The surgical robot is a much more interesting thing than the BCI. But even with the robot, "interesting" rather than "amazing" because (1) what else can that robot do? (2) what does it cost to use? (3) was it reliable enough for humans, or the reason for all the animal welfare issues? (4) some other BCI teams working on delivery via blood vessel and less invasive is better.
Main thing though for any sucessful medical tech is cost. Even with FDA (or non-US equivalents, somehow I don't even know the name of my local equivalent), medical interventions are famously expensive enough in the US to bankrupt and insurance in the US is famously reluctant to pay the full costs.
And up a level, the problem with Neuralink is their output suggests a lack of care to detail, of emphasis on speed over quality, and of having inherited Musk's personal attitude problem when faced with criticism.
Hyperloop was a tech not a company and if I listed every tech he's done wrong I'd be rightly accused of misunderstanding how R&D investments are necessarily gambles.