Things were so much simpler when the only problems that could cause unintended acceleration were mechanical in nature. A broken return spring, seized linkage, etc. My daily driver has a mechanical throttle (although it is electronically fuel-injected), and honestly I can't see much point in "drive-by-wire" for cars.

But, on the other hand, even despite so many possible bugs, AFAIK no one has been able to demonstrate one instance of unintended acceleration even with extensive testing.