Agreed. My plan for updating trail info in large batches is going to be the subject of another post sometime in January, but I am going to try to fully update the entire trail's data over the next two or three years, and try to keep cycling through like that. Until then, it's all a matter of what I can get from individuals who can send me GPS coordinates of points.
As for the old apps being pulled off, the only AT app I've ever been associated with is AT Hiker: Guthook's Guide, which is still in the Apple and Google App Stores. If you're referring to the old ATTrail apps, I was never associated with them and don't really know much about them.