edit: Ok comment. perhaps spacex is not the best comparison though. SpaceX had tremendous necessity driving it. The need for launch vehicles for commercial, scientific, and military purposes.

There is no similar necessity for supersonic commercial aviation.

A Boom customer isn't going to watch 14 test failures and say "well we have no other choice we gotta get people from ny to london in 2 hours" but there was a "we MUST be able to launch people and things into orbit on a US rocket" driving spacex.

You're right about some of the rest of that though. Particularly the personality matter.