In my opinion, the AW139 is the only aircraft that has got it right.
It's not so much the aircraft or manufacturer that has got it right, in this case it was the regulator with primary responsibility for certification. ENAC obviously took a fairly pragmatic view with the AB139 (as it was), whereas the FAA required actual inflation flight tests for the S92.
As HC guessed earlier, Sikorsky went to 80 kts during flight tests, thought "that'll do won't it" and we are stuck with the limitation.