I was wondering how long before somebody caught that.You must have one of those propane-powered microwaves or something. Mine doesn't work when the power's off.
As far as air fryers go, maybe it's just that everybody who wants one has one. Someone gave us one a few years ago, we used it once or twice but it was more of a PITA than it was worth. Noisy, and one of those things that no matter where you stored it it was in the way. Gave it away.
I'm not big on small appliances like air fryers or bread makers. I do admit that I sometimes think about replacing my toaster which died a few years ago.