I think this is an incredibly bizarre assumption to make; the talent used in automotive design could easily CAD any form they desired. These interiors aren't limited by their CAD tools, they're guided by each brand's visual identity. Porsche's references their heritage and the 991 interior has done a brilliant job IMO executing upon that. Whether that's your cup of tea is a whole different matter.
More complex geometry doesn't make something necessarily harder to manufacture. The material, fabrication process, tolerances, design features, undercuts, finishing passes, part count, assembly, etc etc make something harder to manufacture. We can't tell easily from looking at those photos and seeing parts in isolation how complex they really are. In the 911, that silver trim piece can either be a painted piece of plastic or a stamped piece of brushed aluminum (optional) mounted to a plastic substrate. For all we know the NSX's trim piece is also just a stamped piece of aluminum sheet as well. If you don't feel the 911's interior had enough man hours put into it feel free to order the optional air conditioning vent slats wrapped in leather along with every other square inch of the interior.
I'm a huge fan of minimalist designs and try to design nothing but. The beauty of minimalism comes from fanatical attention to each detail, the interplay between those details, proportion, and how the math of everything adds up. If those bits aren't executed upon flawlessly then instead of coming across as minimal, your design comes off as either unfinished or some extruded engineering prototype. The opposite side of minimalism just means following the latest design flavour of the year. Use a flashy new surface treatment (flame surfacing), add drama with lots of random bits (like those random creases on the M4's rear bumper) apply crazy materials and textures, it makes a statement for sure. Once the novelty wears off however you're left with little substance, and that's when your design doesn't age so gracefully because the underlying structure never made sense to begin with. This makes minimalism much harder to pull off IMO. Apple doesn't dominate design because of how long their products take to CAD (they're quite easy considering), they do because of the ingenuity of their concepts and their final execution.
I've seen you use your design background a lot to try and justify arguments on the forum but I don't think you necessarily represent things fairly or accurately. It's hard to split subjective preference from objective design execution apart at times. Try to be more careful when using your #blindthemwithscience card.
