John,
Very well said. Any license could only be an indicator of a minimum standard that had been achieved. It would still need a CV and references to prove suitability for a given job. In Germany, for example, there are test pilot licenses which can be gained in several ways and have 2 categories (TB1 and TB2) which, I understand, relate to aircraft weight categories. Graduation from a military test pilot school automatically entitles an individual to the award of the license for all weight categories. However, none of the German test pilots who I know are under any illusion that upon award of the license that they are instantly qualified for all flight test jobs.
Rgds
L