It’s precisely because teams are signing multi million dollar contracts with these athletes. These organizations are smart enough to know that they will get a better long term return on investment from these athletes if they get proper evaluation, care, and rest from an injury than if they push the athlete to “play through” the injury.

Professional athletes are also much more self aware of what is an injury that needs rest and what is something that they can play through. See for example George Springer immediately taking himself out of the game during the World Series, knowing that it wasn’t something he could just “tough out”.