Not sure I understand your logic. Googles Party mode set the standard. This stand alone app, now creates competition and most likely google will respond with some amazing update. Why would Google be interested? I would think wedding party would want google engineers/designers/product managers.
The advantage of Googles party mode is it's already integrated into your account. The way I read it, is Wedding party has to be uploaded to facebook after the fact. Also, they released and Android product that is subpar, stating, "The Android version isn't yet feature-complete compared with the iPhone app".