Funny thing about this, that in current situation it might be an actual replacement for a real training.
According to Forbes (also https://pingpongacademy.org/ talks about this): However, if players are unable to train with teammates, they may lose sharpness and teamwork skills. Some clubs are turning to Virtual Reality (VR) technology to minimize the negative effects of isolation.

Also Stefan Greuter, Director of Deakin Motion Lab says: “VR training is now extremely cost effective, without sacrificing quality or safety” (he's talking about this technology in au).

And it all started as a pure entertainment for gamers.