Did you mean to say signal-to-noise [ratio] is _low_? Meaning that you get way too much noise for the amount of signal. Or did you mean to say it needs to be high (I.e. low noise) to be useful?
The amount of noise in Fitness apps is so high, nobody really dares to try out small apps. Therefore cool implementations from small devs like the workout-correction might stay unnoticed for years.