Yup. I get that. Always a niche and people buy unnecessary products. I still don’t get tablets at all. Wouldn’t buy one. See no reason for their continued existence. I’m wrong. Like most things people baffle me.
Tablet is a larger screen. That’s it. It’s an inferior laptop and inferior phone. Only use I could think of would again be game or watch films. However once again a tv fulfils that role by a country mile.
Only reason would be as you said portability, however in that sense I’d expect most adults would require a laptop for work and so would be able to dual purpose that.
If you didn’t have a laptop and had to travel frequently then tablet would be a cheaper alternative.