Easterly, what works in a purpose-built disposable racing
boat is not necessarily the same thing as what works in a cost-concious consonsumer market yacht, with a life expectancy of 40-60 years.
Aluminum chainplates may be perfectly good in an Olympic racer
that gets a full-time boatwright and inspections on a regular basis. But out in the mundane Real World? Those chainplate are going to be attached to stainless fittings, possibly bronze fittings, and suffer galvanic problems that go unattended form one season to the next.
Never assume that a designer
or worker who is trained and qualified in one small field, will be familiar with the problems in any other field. Look at the long lists of boats that have failed--often catastraphically--in races, and you'll see how many highly respected and well paid designers have failed to produce adequate designs.
damage (oil canning), rig failures, deck
failures...there's a very long list of professionally designed equipment
failures, including EPIRBs that fail to transmit distress
Of course, the design may have been perfectly accurate, and the USER may have simply taken the boat outside of the designed environment
. That's where overkill really comes in, you ask "What's bozo gonna do to my product?" and try to make sure he can't do any damage.
failures? Rudderstoclk failures? You just can't build a rudderstock that won't fail if someone drops the boat on it and bounces it off the bottom. You'd need a massive beam to carry the entire weight of the boat, in a shock load against a solid bottom. And at least in some cases, we know that's what happens to start the failures. Of course, a designer
could argue that simply means the conventional rudder
design is not suitable for use at sea, and needs to be re-assessed.