awap:If that is the rational, why not service twice a year? Or quarterly? Or monthly? After all, it is life support
Simple, the professionals who designed and sell the equipment recommend it. If they err on the side or caution or just want my $100 a year - fine with me. I'll take their recommendations. After years flying in the Air Force, I don't gamble or wait until something doesn't "feel right". Mean time between failure is not something I wish to deal with. I've lost friends to maintenance issues and am not planning on joining them anytime soon. It is a personal decision.
Have a great day and dive safe.