Easier said than done.
Where is the touch interface? The operating system? The AppStore, The retina display?
Where is the iCloud ecosystem for audio/video media, FaceTime, Siri, AirPlay, TextBooks, Mapping, NewsPapers and Magazines?
Everyone remembers that Microsoft had several thick and heavy stylus based tablets that went nowhere.
,,,because it is easier said than done.
You can not compare these things with the iPad.
The iPhone and iPad were the first of their kind as demonstrated by their wild success.