It is well known that Shotwell runs the business side and Musk runs the engineering/R&D side. Eg. Falcon Heavy was almost cancelled because the engineering sid

It is well known that Shotwell runs the business side and Musk runs the engineering/R&D side. Eg. Falcon Heavy was almost cancelled because the engineering side turned out to make it more expensive to develop than expected (with the original plan for fuel crossfeed) and F9 had improved so much that it ate up most of FH's potential market. So Musk's preference was to cancel it. But because it was favorable for the business side (I think they might've even already bid on some launches with it by then), Shotwell pushed for them to keep it, which is how we got the current variation of FH which just has F9s with a reinforced center-core.