No, I agree with you.
During the time that the app was out for iPhone and those of us who use Windows Phone were still waiting for our version of the app I made the case many times that you get much better results by just using one's own camera app and using ICE on Windows proper.
If you look at that Twitter convo that I linked to above, I'm also the one that asked Photosynth back in 2011:
"for your mobile apps, I request an option to use it only for shooting purposes, export full res shots, + stitch on desk/laptop." (which is close to what you're asking - process in the cloud or during a longer stitch on-device)
to which the response from David was:
"Good request, but harder than it sounds.: Writing full res to flash memory while smoothly tracking is tough."
And that led me to subsequently label the mobile pano app as a great pair of training wheels for panorama newbies, but not appropriate for anyone who cares about end results, much to my chagrin.