We know Tesla has the engineers needed to produce quality designs, but it is management that decided to cheap out on both production and quality control, and doesn't make parts easily available for repairs, which is part of the decision and policies Musk is in charge of.
With SpaceX it could go on both sides just because the engineering for spacecraft designs and rockets is not really a solved problem unlike 95% of automobile design, but management could still be the biggest problem with SpaceX. Of course that is going to be hard to see or quantify without being part of SpaceX management.
Those were just two random examples. You're neglecting all of the good things about Tesla. The global charger network and plug standard, the push for automation. You think Musk had no part in those?
If you want to see bad management in rocketry, look at SpaceX's competitors.
With SpaceX it could go on both sides just because the engineering for spacecraft designs and rockets is not really a solved problem unlike 95% of automobile design, but management could still be the biggest problem with SpaceX. Of course that is going to be hard to see or quantify without being part of SpaceX management.