Two things about air fryers
1. They offer a much healthier method of cooking over frying since their M.O. is the use of almost no fat to cook.
2. They are much more energy efficient than an oven.
What their sudden popularity should tell us is that many people are trying to be healthier, and use less electricity..
Since the recipe books are at least trying to cook from raw ingredients, I would hope that it is maybe a sign that people are looking for cheaper food sources as well, the recipe books won't be on how to shove your chicken nuggets in from the freezer and cook them.
And going by my wife's experiences in school, those least well off and on benefits who complain about things like shrinkflation by far spend an inordinate amount on 'fast food'..
And no surprise:
Although I would say that fast food in general has seen a meteoric rise since the pandemic, people in work who complain about the price of food etc all eat out way more than they used to.
We plan our meals as much as we can and prepare ahead of time, out food bill has gone up significantly, but nothing compared to some people in work complaining who eat out, they are spending 300% more than they used to and don't seem willing to change this, just complain because that's easier and it mentally validates their decision to spend more on takeaway.. (IMO)..