you bring up a great point about people like you who would only get a one day pass. This would be the system you'd use to schedule Fastpasses but as far as I know it'll be kiosk-based, which as I think about it would be less ideal then what they currently have in place (which isn't very ideal at all in our minds).
As APH's ourselves, we're looking forward to the ability to reserve our FP's in advance, whether online or via our smartphone apps. Personally, this is the part which frustrates us as it seems the APH's would be outnumbered by resort guests on a given day at the parks. So, if the majority of people visiting the parks are already using the full FP+ system, what more can Disney be testing to get this thing rolled out to everyone?
I'm sure Disney is trying to get as technologically advanced as possible regarding their system. They probably have it in their minds if the majority of guests reserve FP's online it'll make the lines at the kiosks smaller.
Their desire to become more efficient and technologically advanced seems to make things just more confusing for the end user and, as you put it very well, less magical.