It needs something...a small main app Q&A...all this health data being collected from, calories burned from effort, calories burned from being alive, macros in, your running data, VO Max, etc...and there is literally nothing to let your watches coach or the training algorithm know when you are ill or injured. Everyone I know with whatever the watch always wishes they could tell the accompanying app when they are sick.
Thanks, I surprised myself with how quickly I fought the winterbug off