I'd urge all of you to put the Ping lawsuit in a special, separate category, rather than conflating it with golf balls and spring-like COR rules and the like. If you read Karsten Solhiem's side of that case, you get a VERY different impression of what happened. Ping's position, I think, was that the groove rule was changed specifically to hurt Ping in the marketplace, rather than having anything whatsoever to do with performance, AND that the USGA measurement was bad engineering, which is what REALLY ticked Karsten off.
And, in fact, when Mickelson had one of his crazy moments and brought his Eye2 lob wedge out of mothballs, testing at the time showed that it created LESS spin that current conforming wedges. That groove change was meant to do one thing; hurt Ping's sales, not "protect the game".