Hate to disagree with you but bat composition does make a difference:
Another reason I know. My son just hit the ball 350', he is 13. He isn't doesn't have an exit velocity of 95+ - I guess I should say composition + COR. so a bbcor will outperform wood. ussa bats will outperform both.
have tested this "phenomenon". To be exact, a wooden exit velocity may be one (1) mph slower than a bbcor. The entire idea behind BBCOR was to reduce exit speed to that of a wood bat for safety. USSSA bats will outperform both because the composition is entirely different.
Launch angle plays a big factor in velocity. A 350 foot frozen rope will have a much higher exit velocity than a moonshot/ Roy Hobbs type of hit. The rest MidAtlanticdad explained.