Honestly, each device has it's use. The things I personally use most in my kitchen are my Instant Pot and my Crockpot. I prefer to be a "dump and go" kinda cook. LOL So for me, the Instant Pot (electric pressure cooker) is great for making all kinds of things I would normally do on the stove or oven but in the IP I don't have to stand there and babysit them. Rice, pasta, chicken breast, baked potatoes in half the time, hard boiled eggs, even those dinners-in-a-bag from brands like Birds Eye, just to name just a few of my regulars.
Some people complain as above that the IP makes bland food. Those people aren't doing it right.

You want to use flavorful broths for your thin liquid instead of water. Any powdered seasonings need to be increased a bit because with pressure cooking you are using steam and steaming can waste some of those seasonings.
I don't have an air fryer yet so I can't give advice on that front. I am thinking of putting one my Christmas list so I'll be reading along here to see what people recommend!