All sorts of technology lurks on the fringes until it hits the right form factor.
I remember people -- including here, as I recall -- saying the iPad would be a huge flop both because of its funny name and because tablet computers already existed and the market had largely rejected them.
We got our air fryer during the pandemic, when everyone was legally required to either buy one or an Instant Pot, and discovered we loved it. Lots of frozen food that's extremely mediocre in the microwave is restaurant quality in the air fryer and it's just as easy to use for all ages.
We actually used ours until it died and then bought a bigger and better one. It gets more use than our microwave does now.