This issue was discussed thoroughly on last night's Sweep the Rack podcast. Some very interesting things came out of that discussion.
1. The three Purple Hammers that failed the hardness test were "Kentucky" balls from 2016/2017. When they failed, they were confiscated.
2. Mitch Beasley posted on Facebook that there was a batch of Kentucky Purple Hammers in a specific serial number range that were manufactured too soft, and tested in the 60's for hardness. Due to the actions of a "bad employee", they made it out of the factory and were shipped. Mitch also alleges that there are bowlers that actively seek out balls that fall in the serial number range so they can have the softer covers.
Now, getting back to the USBC's latest statement which was not mentioned on the podcast (the urethane ball study was, however.) The USBC has been aware that urethane softens over time, but then stabilizes after a certain amount of time. If the USBC is aware of this, and knows that all urethane balls soften to a level well below the minimum hardness requirement when new, why would they continue to approve any urethane ball? If that is the case, the argument could easily be made that balls should not be deemed illegal simply because of age. Are we going to reach a point in USBC competition where a urethane ball tests at 68D, but is still legal due to age? The USBC's statement seems to condone the softening below minimum due to age.
Increasing the minimum hardness spec to 73D as of 8/1/22 doesn't do anything to address the issue. If 72D urethane balls are already dropping below 70D due to age, increasing the starting hardness to 73D isn't going to stop that from happening.
Ultimately this whole issue is just pointless. A human still has to be able to accurately and consistently throw a ball. As they say, "it isn't the ball, it's the bowler." If these urethane balls were really causing that much havoc on tour, you would be seeing bowlers every week winning the championship using urethane. I don't see urethane winning each and every week. It may be in the hands of people in match play, but it isn't in the champion's hand every week.
The PBA made the best decision they could to address the problem. It simply means that Simo won't be using his Roto Grip Grenade any longer. The Kentucky Purple Hammers are out of play. No more Hot Cells, early Mixes, Pitch Blacks or Pitch Blues, etc. Tommy Jones was using a U-Motion for spares in the ToC. That is still legal but only by a couple of months. The PBA equipment truck is going to be really busy the next couple of tournaments. Hope the ball companies get it stocked up with fresh urethane