"declared the mission a success for igniting all engines and leaving the launch pad" yup bar is low when Musk rocket scorches off engines, showers debris on civilian cars and real estate and wildlife reserves, goes to 24 miles and explodes.
The point that you appear whether or not Musk or SpaceX existed, it is highly reasonable to for a first rocket launch attempt to be considered pretty successful if all engines ignite and you get off the pad. That was true before Musk and SpaceX even existed, and is still the case independent of whatever SpaceX is doing.
People have been trying to synthesize N6 for about a hundred years. In that regard it is similar to trying to synthesize tetrahedrane https://en.wikipedia.org/wiki/Tetrahedrane. But people also synthesized cubane a while ago https://en.wikipedia.org/wiki/Cubane and attempts to make it large enough quantities for rockets were not successful. In the 1960s through the 1980s there was a general tendency to want to have really extreme substances and use them either as rocket fuels or rocket oxidizers. FOOF https://en.wikipedia.org/wiki/Dioxygen_difluoride and ClF3 https://en.wikipedia.org/wiki/Chlorine_trifluoride are the two most infamous ones, and both of those are really easy to synthesize, but just insanely dangerous.
However, one of the major insights in rocket development in the last 25 years has been that even if you can get a few percentage points more of energy out of a rocket fuel, if the fuel or oxidizer is really hard to make or really hard to safely use, then the difficulties involved just aren't worth it. Thus, the cheaper, more reusable rockets were now seeing like SpaceX's Falcon 9 and Rocket Lab's Electron use fuels like kerosene and methane. N6 seems like it would not fit in this paradigm unless someone comes up with a really efficient synthesis method.
That's all the more the case because twice as energetic as TNT isn't that energetic. Methane has a specific energy about 10 times that as TNT. TNT is really good as an explosive not as much because of its high energy but because it easily releases it all at once. So if N6 does get a use, it might be for making missiles and bombs.
CCI Power 6/40: one board, a megabyte of cache, and an attitude...