MLB owners voted to enforce a rule on the books, keeping coaches in the coaching box until a pitch is thrown. The idea is to prevent coaches from picking up tipped pitches.
This raises the question as to why the rule was not enforced previously. A rule not enforced is not a rule, and it can be ripe for abuse. It can be selectively enforced against coaches you don’t like. It would be nice if the owners voted to enforce all the the other rules where enforcement might be lax.

