No. It's not "very different". You're just trying to be contrarian. 3 series and M3 has 90% the same infotainment. But 5 series and M5 competition is being developed by a completely different company. Even if they are 95% the same. Nobody is iterating on anything. The same climate control is implemented 20 times by different companies. It's just that the 4 variants of the 3 series usually are made by the same company.
"For the next BMW car everything is rebuilt from scratch" does sound very different to me from "the system is developed by a different company in each multi-year cycle that covers dozens of models".
Maybe you're trying to tell me that I should have understood that you couldn't really mean what you wrote because that's just absurd? In that case you may be right.
I guess that when you say "nobody is iterating on anything" you cannot really mean that either - because it's just equally absurd to think that completely independent systems were designed from scratch multiple times without any reference to the previous ones and it's just by chance that the first version had a dial only, the next "non-iteration" a similar dial and two buttons, later more buttons appeared, etc.
