I wouldn't want a preconfigured temperature for my shower, because a lot of the time I fiddle with the temperature valves while in the shower. Depending on many factors such as if I'm sweating, the outdoor temperature, etc, my preference for just shower temperature would change, and it's not like I can say "Oh, rain means a water temperature of 73 degrees!" Unless the app can accurately predict what my shower tastes would be, there's no point.