Worked for a car manufacturer doing statistical analysis on gap & flushness all over the exterior… And the door gaps are a bitch to get right. Probably the most difficult ones over the whole car. All the manufacturers struggle with this to a degree. This is also the one place where part quality is probably most critical.

The other gaps are usually handled by designing the angles in a beneficial way etc. When they show up in a bigger way it’s almost always bad design.