It wasn’t a fluke that sneaked by because I had to appeal to get it renewed. So I know they thought about it. I first had a Tankerman PIC Tankship-DL from working on ATBs. 1st renewal no problems. During my 2nd renewal they denied it because I wasn’t working on ATBs or barges any longer. I appealed it & they downgraded me to Tankerman Barge. I had a Tankship when I wasn’t working on ships & the gave me barge when I no longer work on barges, go figure?
Concerning the benifit of engineerings having a Tankerman PIC endorsement, yes, mostly for the extra ink in the MMC in case of a worse case scenario. Also, any additional education or classroom time where even a little bit is learned is a reward in itself. I don’t regret the company paid vacation in St Petersburg FL.