My son uses wood all season in cage, He started that when he was young and there was no such thing as BBCOR. I guess I disagree about no difference in BBCOR and wood. I think BBCOR is better unless you have a very very good wood bat. You wouldn't use that for hitting practice anyways. So on an average relatively cheap wood bat, sweet spot is really tiny.
I have absolutely no scientific facts on this. Just what I have seen by watching my son. He focuses on the correct way to hit more because if you don't ball won't go anywhere.