Since the Pilot app seems to be such a resource hog, I'm wondering if the extra 2GB of memory will give more stable performance over time.
Honestly, this is a possibility, and one I hadn't thought of before. Truth be told, this is only because I wasn't aware as to how much of a resource hog the DJI Pilot app is. Since the Android version of DJI Go (aka version 2.0.0) isn't out yet, there's the possibility that the programmers have "trimmed the bacon off the hog", in the same way that Symantec rewrote Norton, from the ground-up, a few years ago. Just as Norton had become a (serious) resource hog, but has been made considerably faster (in every aspect), the Android version of DJI Go could turn out to be a similar "clean-up".
If it turns out to still be hogging resources, then my previously-mentioned idea of picking up a Z580CA as a replacement for the N7 LTE I'd give my girlfriend could be rethought. Instead, I would still (probably) pick up the Z580CA, but that tablet would become the dedicated P3P tablet. Once the DJI Go app is released for Android, I will compare its use against the DJI Pilot app, on both the Z580C, as well as the N7 LTE. I might go so far as to make one flight using DJI Go on the Z580C, followed by a second flight using DJI Pilot on the N7 LTE, and compare the two against each other.