I’ve been encountering fewer and fewer of those that still work lately. Most IVR systems I’ve interacted with just disconnect you if they can’t understand your input.
It was true at one point, but has since changed. The systems are totally air-gapped and worked 100% of the time, so there was never a reason to change them.
Also true: Boeing still uses floppies to update their 747s.
What really baffles me is how people that have dishwashers manage to do this. Like, use bowl/whisk/cutting board/whatever > put in dishwasher. That way, all you have to do is wash your knives while everything else cooks.