SX sure has a lot of "Get-er done" in them. Try something, see how it goes and adjust afterwards. Rinse and repeat until you're very happy but still be willing to push even harder if it you come up with a better "idea-er".
So many engineer types want to avoid or minimize risks and plan out every detail before starting. Even if they are aggressive the bean counters in management are always pushing to minimize immediate costs and to target "just good enough".
It seems to be a management miracle, to get teams to work together and focus on the task at hand and putting other projects on the back burner in order to find the best solutions in front of them. I am sure they have rough plans for payload and crew quarters for Starship but at the moment they don't invest a whole lot of time into that, it is launch, catch and re-fly ASAP. Then it will be orbital refueling, ASAP. The rest of it can be refined once those main objectives are reached. Don't lose focus on anything else.
It would be fun to work there for a few years but I think eventually it would eventually invite some serious burn out. Always going at 125% eventually eats you up but if I was in my 20's or early 30's it would be so much fun. I think back to NASA/Apollo in the 1960's when they were trying to figure out how to go to the Moon.
Most likely it is even more fun considering they don't have to worry about funding from Congress and playing all the political games the old timers at NASA had to deal with that forced them to have to deal with so many subcontractors all around the country. Being able to work on multiple parts of the entire systems all at once all under one roof has got to be very exciting and it has to encourage some interesting group think solutions.