I don't see Porsche's, Hellcat's, and BMW's having issues with something that has been a resolved non-issue for decades at this point.
I too "find it within the realm of acceptable that a $30,000 car would have issues that should absolutely not be present on a $100,000 car". If, say, a plastic piece on the dashboard tends to develop an unsightly crack over time, that's more ok for a $30k car than for a $100k car.
But some design issues should be present on no car; not a $30k car, not a $100k car, not a $5k car. "The car sometimes accelerates on its own" is one of these.
And I will preface this by saying that Audi isn't without fault either, but my also $100Kish RS 5 has in two years had two issues: a battery failure (determined to be a battery fault, not a vehicle fault), and improper drainage in one of the doors, leading to an accumulation of water, that had a tech advisory to add an additional drainage hole.
Looks like they've recalled almost 1 million vehicles and have tried multiple times to address the issue.
https://bimmers.com/blog/pcv-valve-heater-recall-explained/
I don't know enough if that meets your requirement of "something that has been a resolved non-issue for decades at this point" but it's something that BMW has apparently been trying and failing to fix for awhile now.
I have higher expectations for my poorly made death machines.