Granted, with the exception of Riku and possibly Xehanort the KH game series isn't exactly well-known for the stellar characterisation or character development of its characters (the novels do much better when it comes to the characters), but the potential is definitely there and an improvement of the writing is always possible.
It's half that and half that I simply do not have the need for one of those fancy new thingys.
Writing the occasional SMS or simply old school phone calls is what I mostly use it for, I don't even need any on-the-go internet (I'd rather look at the environment and nature rather than constantly on a tiny screen) and I am certainly not a fan of all these social network-vampires who want nothing but to suck up your private data.
Yea, don't have a phone that can play it (and honestly also not the free time at hand), so I follow solely the story cutscenes in order to keep up with the developments.
Well, Eph already got more than several other of the KH original characters got.
When one compares his initial self from Browser-chi (which is Japan only) where he's just an inquisitive, curious and friendly kid who has to stick his nose everywhere and is trying to decipher the truth behind the Book of Prophecies and the weird events in the world, to the rather insecure grand leader-figure with huge responsibility pushed upon him there is certainly a difference in outlook.
The story of Union Cross also just started and as its looks like he's going to develop some closer ties with both Skuld and Ventus, so the potential for more is certainly there.