Imagine paying $43 to watch a pre-recorded event....
There is no guarantee that it is really the girl dancing.
They could have hired a mocap dancer to do everything.
Also there is no guarantee that they didn't edit in post the captured data. This is like auto tone, but for dance.
Also they could have applied auto tune on their voices.
You will never see your oshi falling on stage
https://www.youtube.com/watch?v=YmtAWY6Y4F8&t=61s 