Yes its fair since if you did a full FAA ATP examination suite and fly N reg, then if you want to fly a EU registered aircraft you do the EASA exams and conversion! As someone that had a full HK ATPL and wanted to fly in EU I had to do the EASA exams and accepted that regardless of the 1000's of hours I have on wide body aircraft. It is well known some authorities have easier exams than others so it would just be easier to do them and then convert to EASA etc.