It’s entirely understandable that the focus of bowlers on social media regarding the latest changes for the U.S. Open announced Wednesday by the United States Bowling Congress is on the limited field size.   It’s the sizzle that gets people riled up — even if they would never enter the U.S. Open. But it's not the truly significant change.  For the record, I don’t have strong feelings either way when it comes to a 400-plus bowler field or a limited field of...