Why do people want to fold their phones again?
It gets you a bigger screen in a smaller form factor. When you don't need the big screen you fold it. When you want to watch videos you unfold it.
It's smaller than an iPad until it isn't. It's probably very convenient, especially if you don't want a laptop.
But yeah, kids sit on electronics all the time. My BIL's house is a mess, and they have two or three iPads and surfaces that are now right-angled e-waste.