Why do you guys feel like you need top of the line specs for web surfing and watching videos. The experience will be nearly identical. Most modern iPads are the same. The only real difference is size and shape.
I think that you have a valid point for most people. In my use case, i use it for sketching and drawing, post processing, i enjoy using/learning shapr3d as for work i have to do 3d modelling and trying to see if i can adapt myself to shapr3d but it is a little bit different kind of modelling process compared to nurbs modelling (Alias Studio) so for me, any performance bump would be welcome.
For people who just use it for video watching and basic web surfing stuff, I think that the promotion display can be interesting if it is used during web browsing (for scrolling smoothness) and on video if it use higher FPS but i don't know really as i have never had a direct experience with the promotion display yet.
Second reason, for those who go 12.9, can be the screen size, as without doubt, watching on a bigger screen, or reading on a bigger screen can be pleasingly welcome for many, especially on the go.
Third reason that i can see would be the form factor. I don't think that anyone would argue that the rest of the iPad line up, looks very dated compared to the Pro versions or Android Alternatives. And looks for many, can be a decicive factor. It would be for me, if the money wasn't an issue.
Also usb-c support is something nice to have too, especially for people who may have big video libraries, they can take it with them on usb c flash drives or hard disks.