All of the uses so far are bad, and I can't see any that would work as well as a trained human.
I'm no AI enthusiast, but this is clear hyperbole. Of course there are uses for it; it's not magic, it's just technology. You'll have been using some of them for years before the AI fad came along and started labelling everything.
Translation services are a good example. Google Translate and Bing Translate have both been using machine learning neural networks as their core technology for a decade and more. There's no other way of doing it that produces anything close to as good a result. And yes, paying a human translator might get you good results too, but realistically that's not a competitive option for the vast majority of uses (nobody is paying a translator to read restaurant menus or train station signage to them).
This whole AI assistant fad can do one as far as I'm concerned, but the technologies behind the fad are here to stay.
A plastic nob is cheaper than a touchscreen, yes. But if you've already got a touchscreen as part of the design anyway (for things like satnav or car maintenance data), it's cheaper to not include any other buttons or inputs and to bundle them all up into one interface.