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But the point is, on a bigger screen than the iPhone is it a useable thing? is it convenient and possible with the same ease to use it on iPad Air as on an iPhone !

The convenience would depend person to person just as it does on the iPhone. For some, they LOVE 3D Touch. For some, 3D Touch to them is a gimmick.

Personally I would like it to come to iPad. There's more to the feature than Peek and Pop into content. It's also quick access to functions of apps.

I've sent feedback via the feedback app to allow the Pencil to enable 3D Touch features for the iPad Pro since that could handle the pressure sensing without all the added actual 3D Touch tech in the screen itself. They could very much do the same for the Air 3 if they gave it Pencil Support.
 
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