I disagree. I bought an air fryer for my mom about five years ago, had an older breville toaster oven without the air fry capability I used for the better part of a decade, and moved to a new breville toaster oven with air fry capability about a year ago. The basket-design air fryers are a pain to store, don't have much space for food (we had to do fries in annoyingly small batches), and felt very one-note.
By comparison, the new breville I have does everything the old one did plus air frying, and the difference is distinct - I tried making fries in the convection baking mode on the old one and the result was noticeably worse than what I get from the new one in air fry mode. Noise and heat output approaches annoying levels with either air fryer, so I'm pretty confident the experience I get is close or the same as the purpose-build one. And the ability to space things out more gives better results, at least for my purposes. (I'll note that 95% of my air fryer use is for fries.)
I would recommend The Professional Chef - it provides techniques and how do them, and follows this with recipes that apply them after. As might be expected though, this is a fairly serious book.
By comparison, the new breville I have does everything the old one did plus air frying, and the difference is distinct - I tried making fries in the convection baking mode on the old one and the result was noticeably worse than what I get from the new one in air fry mode. Noise and heat output approaches annoying levels with either air fryer, so I'm pretty confident the experience I get is close or the same as the purpose-build one. And the ability to space things out more gives better results, at least for my purposes. (I'll note that 95% of my air fryer use is for fries.)