Firstly, what makes the old designs illegal?
Also, I've had my original titanium 6 years now, been hit many times at decent pace and it's still perfectly fine. Was there any real need for a drastic change from a tried and tested product?
The old test was merely a drop test on the top off lid.
New test is a ball fired at peak area, no ball is allowed to pass through to hit a batsmen,
The spec has changed to prevent this, plenty of pros have had hits to face from ball penetration, but it also happens at lower level, I've been at junior games where parents have adjusted the grill for maximum sight, and a full toss or top up edged has penetrated,
Thankfully in my instance blood, cuts and a broken nose are all that occurred, but there are stories of junior having broke ney sockets, and damage to eyes.
No one wants a 12year old to lose sight in one eye, so hence the change.