Literally any subject matter expert on the subject of transportation can spell out a half a dozen things that make no sense/are actively harmful about all the attention and investment these projects got. Well There's Your Problem has a 3 hour slideshow on the subject, for example. Musk was even caught on the record admitting one of its motivations was to fuck with real transportation projects like California HSR. The whole thing was all-but-provably an elaborate con.