Well I'm convinced by the health claims. Salmon cooks in 10 minutes without any of the splatter and no need to clean anything by hand. Frozen vegetables can be roasted using much less electricity than in the oven. Potatoes and chicken Kiev are cooked with only a drizzle of oil. I'm a big airfryer fan and not only for "fried" foods but also the ability to "roast" food without the electricity cost of running the oven.
I suppose it all comes down to how we define a "healthy" diet. I'm about 97% vegetarian and when I do eat meat, it's minced. I love fish but we rarely cook it at home (which I cannot explain at all

). I cook a lot with olive oil, rather than animal fats and use ghee, rather than butter. I could probably eat a kilo of cheese a day if I had the money to do so - but I haven't! I rarely roast vegetables, curiously enough, but we do use the oven a lot. However, the electricity bill is generally about $30 a month...
About once a week, I'll just eat a salad for lunch/dinner. Lettuce, tomatoes, cucumber, peppers, arugula, cress, potatoes, raw broccoli, beetroot,etc., with simple olive oil & vinegar dressing. We consume loads of pasta.
My youngest (who swears by his air fryer) eats BBQ twice a week, tomahawk steaks, picanha, burgers, hot dogs, pork chops, grilled chicken, sausages and chips. Chips are his vegetable intake. Oh, and I forgot the once a week pizzas with double cheese and bacon!