Or for safety reasons. Why does the ASA have limits on bats? Is it to make it more difficult to hit the ball. Nope, it is primarily for safety reasons.
I played in a league out in Cali that only allowed single walled bats and would not let me use my ASA bat. It had nothing to do with making it harder on the hitter. It was because there were a large number of elderly players and they were concerned about safety.
You are wrong that safety is not a legitimate issue.