They can do more than that, yes, but the vast vast majority of glasses users just need a prescription refresh every 5 years.
I’ve used one of those devices. It takes 30 seconds to learn how to operate and is very accurate. I really don’t understand how optometry exists in it’s current state.
They aren't that accurate and actual promote bad prescriptions - they tend to suggest higher myopia and astigmatism.
Well, I tried it along with ~10 other people who already knew their prescription and it was self-reportedly accurate every time.
It would be nice if this was at least an option for people who might not have vision insurance or for whatever reason don't want to proceed through the traditional system
https://en.wikipedia.org/wiki/Autorefractor
However optometrists do a lot more than just write prescriptions for corrective lenses.