Not sure I agree. A "short fat" could theoretically be replaced by a group of "short skinny", whereas a "tall skinny" could only be replaced by another "tall skinny".
As value is largely determined by scarcity (supply and demand), this would cause "short fat" to be of lower value.
It depends on how depth of knowledge is measured. One is considered an expert in a niche because they know it inside and out. But in theory, multiple people with a disjoint subset of knowledge of the niche could also be a reasonable replacement?
As value is largely determined by scarcity (supply and demand), this would cause "short fat" to be of lower value.