I just read this morning that the Dodgers sent like 5 players down to work out with Driveline, including Betts, Muncy, Lux and Chris Taylor. Apparently with the weighted bat program and some analysis and efficiency changes to his swing, Gavin Lux added 6 MPH on his bat speed...
https://www.nbcsportsedge.com/baseball/mlb/player-news/11079896
This type of stuff is the future of baseball. I sure hope we don't bring in old vets who tell batters to "take the knob to the ball" and pitchers to "pitch to contact". I worry the vets are generations behind in terms of the technology and training programs. Hopefully we have a stable of new age coaches who are pushing tangible improvements and the old vets are simply there to help with the mental side of baseball - getting through the grind and things like that and are leaving the training and strategies to the experts.
I'm also shocked that the Dodgers had to send players to Driveline. I would think by now that all teams would have replica facilities setup with players using these to drive improvement.