I would argue that 15 years is not a mind-boggling timeline to go from first car to best selling single model (especially given how few models Tesla has).

Xiaomi Auto reaching a quarter of Tesla's annual output after four years is much more impressive, given it took Tesla until 2019/2020 (8 years, twice as long) to reach that level.

SpaceX is rather more impressive. Unfortunately for everyone, only someone like Musk could have pulled that off: not just the visionary, but also arrogant and litigious enough to sue the US government to reconsider when the government decided against buying from SpaceX. I'm reminded of the phrase "only Nixon could go to China".