That style of "air fryer" is just a convection toaster oven with an air fryer rack. Shameful marketing, if you ask me. A real air fryer (the ubiquitous basket style) cannot be replaced with another appliance, but replaces many, while doing a better, faster job.

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.)

For example, George Foreman decommissioned. Sausages never cooked any other way. Chicken nuggets, love them or hate them they cook great in the air fryer. Main convection oven only really used in our house to bake bread.

Why is the basket useful?

Baskets are useful because they allow the items to cook from all sides, and not require turning in the same way.

Personally, I use a separate metal basket in my convection oven. But it's entirely possible that more convection would be better.

If you like baking bread and you have the space, I would suggest getting a steam-convection oven, like the one from Anova.

You can also steam-slow-cook meat and get juicy tender chicken.