As far as I am aware the rationale for having an app that holds the points instead of having them fixed on the cards is that rolling adjustments can be made. This could be for errata or points manipulation at tournaments.
Given that there is no offline mode, may I ask how this will work at a venue that has no internet coverage? If I turn up with a list (with points changes) that someone else then questions how will it be checked?
Will a tournament organiser have to drive down to the local Macdonalds to use their free WiFi and go through each player's list?
I am eager to hear how this situation is to be resolved.