He actually has outlined exactly what's wrong with these ideas. I mean the hyperloop was supposed to be "like an air hockey table", well guess what, musk now "advocates for wheels"... It's just a really bad and unworkable idea. The idea of 1000km long vacuum tubes is beyond stupid, when we already have high speed rail. Please tell me how stating these facts are "small minded" or "pessimistic".

His main point is usually about the massive unwarranted hype and blind hero worship around these concepts, and usually scams (the water stuff and other kickstarter projects).

The truth hurts, I guess.

Sure, some videos are more of a rant and he can come across abrasive but I think the fundamental arguments are valid. Hyperloop isn't a viable concept ever since it's been conceived over a century ago. And the tunnel projects have so far been underwhelming and universally panned as worse than a standard lightrail or subway.

The only thing that's relatively unknown is the "Tesla Bot" but considering that self-driving AI is still unsolved, let alone any kind of general intelligence, I don't think there's much behind that either.