Ok,that's mean to analyze the response of neuro-muscular system caused by unexpected perturbation, simulation (i.e. gait modelling) is more beneficial than analyzing gait variable data separately which has been collected through some wearable/non-wearable devices,right?

And you are saying that it is due to "
participant variance of the measure across repeated gait cycles pooled across subjects" i.e. measurement of gait variables may be incorrect by observers,right? But observers i.e. researchers are extracting just sensor output data to analyze stability.Can sensor output (i.e. IMU or Kinect) data be incorrect?

Have I rightly clarified your answer? Or are you saying that advantage of gait modelling is mainly in its ability to analyze "unexpected" perturbation i.e. stability can more accurately be measured and justified through gait modelling?