And my point was that this isn't merely a "poor SW testing" problem, but something broken from the get go. Disparate systems shouldn't be connected together such that one thing breaking can cause others to break.

It does not follow from the article. You're just complaining about a different annoying thing that uses the same screen on some cars. A lot of controls are quite far away from simple on/off switches nowadays, so there's probably software behind that too (hopefully simpler and with better testing).