They are breaking more than they used to break, and breaking in a more dangerous manner. Prior to 2000, almost all ML bats were ash. Now, about 50% of the bats are made of maple. Ash doesn't break as easily, and when it does, it tends to crack, whilst maple tends to snap, sending dangerous unguided wooden missiles about. This is what the people in the business have been saying. I don't follow baseball or any other dumb ass sport, so I only repeat what they are saying, and it makes sense.
Why do you say this is not happening?
I do know that EVERYONE in the major leagues knows ALL about grain direction, and so do the bat makers so the Government Forrest Service is wasting our money on this crap.