When our old microwave got replaced I missed the feature of being able to program sequences. Typically you'd heat for so many minutes, pause for a minute, heat for some number more. Maybe the first and second sessions would be different powers (can't remember that long ago). Frozen meals came with those sort of instructions and the microwave just had a feature to easily do them (the meals weren't designed for that microwave, just generic heating isntructions).
I don't recall anyone acting superior because we didn't stand there operating the controls in real time!
Seems to me that this air fryer is just an extension of that. The meals could be supplied with instructions printed, and then you program those into the air fryer. Would that be more acceptable? Using a QR code to do that just seems to be keeping up with the times.
The thing that would be dodgy are making the meals and oven dependent on each other (a la juicero). I imagine it could be argued that knowing exactly the oven spec allows better instructions, but everyone else seems to manage with '2.5 mins 900W, 3 mins 800W' so timing isn't that critical. Of course, the oven would need to understand the QR code, but if that was a known format that anyone else could use I think that would be fine. Locked format is just the Gillette and razor blades thing all over again.