Don't you guys also want the 3D Touch on the iPad Air-3/Pro I think that could also be handy !
No. I have it on the 6s+ and it's fine but not earth shatteringly useful. Handy for quick access to something with the phone in one hand. Less critical for a tablet you're likely using with two hands while sitting down. Also I'd be worried about pressing hard in the middle of a large screen.
Pencil support on a large screen tablet is a lot more important IMO