They are just the easiest to make.I would agree that I generally think of scrambled eggs as more kid friendly. I remember enjoying them more when I was a kid. I don't think it's that big of a deal though. I will still eat scrambled eggs, unless they are soggy, and most of my kids prefer fried eggs over scrambled.
My hot egg take is that omelettes are trash. You can take any omelette and just make it a scrambled egg dish and it's better. Omelettes are just over cooked scrambled eggs that are harder to eat