It's only an advantage for an already good/strong hitter and significantly weak (frail) hitters imo. The difference between a shaved bat is similar to going from end loaded to balanced. I have a composite bbcor that swings like a -5. It has as much pop as my end loaded -3. Any kid 12 and up can swing a bbcor. You just have to find the right length. 14 year olds 5'6 kids trying to swing 33" bbcors are idiots