While I agree with you in principle (not about Hitler, but the KISS part), it wont happen.
Marketing and sales are all about how to differentiate cars from others. Those features are what drive profits. Profits is what drives the car industry. What I mean is that they take a $100 screen and box, and put some software, and now it is $2000 infotainment system. $1900 of pure profit. They can sell the software and update last years model car as it has the same screen and box, but nope, new car to get that new feature.
Everyone is looking for something, and once it hits that point, it becomes expected. I loved my 1994 Pontiac Grand Prix, but I could not drive that today as there were not that many features that I would consider essential in today's world. I am not alone, most car buyers are that way. 20 cup holders, place for a 20" laptop in the center console, big screen, app integrations, wifi, etc. are all features people buy on.
Now if we are looking for people who would buy new, but don't because they are looking for value (slightly used, big depreciation hit taken already), or cannot afford new, you won't make much profit unless you can churn out a ton of those cars. GM tried it (and failed), VW tried (and failed), Nissan tried (and is still failing), Toyota is the only one that has not fallen on hard times with this strategy.