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"Calm down, boys"
I think you are right that where you want to live on the risk/reward
continuum is a personal decision.
But I don't think you should confuse that issue
with the facts about electronic failure modes. Brent and
Hamid, who have tried very hard to eliminate them, are saying there are some
failure modes, which have significant probability, against which you cannot at
reasonable cost protect an efis. Adding a third one or a
redundant supply doesn't particularly help the situation.
Adding a system which doesn't have that particular
failure mode completely changes the probability
numbers.
If you are content not to change the numbers in
your favor, that IS a personal decision.
On the other hand, to hold that an all
electronic system has as favorable probability numbers as electronic plus
mechanical backup is not a matter of personal comfort level. It's just not
a correct statement of the facts.
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