We check stuff to death in helicopters, logic, practicality and statistics take second seat to dogma. OEM’s cover themselves, regulators oblige. You can do a 15 leg Cat A operation after a morning PA check, but because the clock ticks past midnight you suddenly have to do another. Same could be said for all kinds of checks. Some AC are better with more sophisticated DECU/FADEC systems, but a really good system would constantly monitor PA in normal flying and advise of any deterioration. Second best is the push button in cruise type. In some future century the helicopter industry will follow the auto industry to OBDII type monitoring.