Yeah, water is way harsher environment than a race track. It's 800 times as dense as air. Reliability on the track doesn't translate to reliability on the water. If you've ever tried running in water, you know what I'm talking about. It's like running a car with 5,000lbs trailer up hill in first gear ad WOT all the time. The race track just doesn't compare.
Workhorses vs. Racehorses.