> They always overpromised by a few months. It's been a pattern since the start.

I think this is an endemic problem with Elon Musk himself. He's always very optimistic about all his ventures (Tesla, SpaceX, SpaceX's Texas launch facility, Hyperloop...). He seems to have issues with estimating real-world issues that creep into every project.

However, like you said, he does always seem to get there in the end, one way or another.