You've described why the phablet might not be the best choice for you. But I am not you, and you don't have any business telling me that my reasons are not "truthful". Perhaps you are the one who is lying to yourself.) You don't have a way of knowing all of my needs, which makes your reasons for wanting to deny me access to a phablet irrelevant.
For me, texting is easier on a larger device, so for texting, I'd prefer an iPad. But I don't want to carry my iPad with me every where I go, so a larger iPhone will be better. Same goes for music in the car--easier for me on a larger device. I'm looking forward to taking pictures with the bigger screen, though my iPad's screen is really too big for most photo-taking situations. I don't usually hold my phone up to my ear when I'm making calls, so I don't have a reason to need it to fit comfortably in my hand (most smartphones, including the current iPhone, aren't all that ergonomic for holding up to your ear anyway).
Those are my reasons for wanting the larger device, and I think they are more logical and truthful for me than yours are for wanting me not to have it.