The OP wasn't being metaphorical in any sense, they were literally describing how caucuses work. If your first choice doesn't meet a qualifying threshold in your precinct, then you can switch your vote in the second round, and supporters of other candidates can literally try to convince you before that round. It all happens in the open with people literally crossing to different parts of the room to caucus for different candidates. The app -- and its failure -- didn't change any part of this process.