Over-qualified so that anyone can do it
There's a leap of logic in "it can't be just one person who can do it -> everyone should be able to do it."
There is a significant risk to Business Continuity if there is only one person in the organization who can perform a given task." To avoid this risk, "let's make sure anyone can do the work" is over-quality. If two or three people can do it, it is sufficient.
Allocating excessive costs for excessive quality is a harmful business decision.
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