Theory : "there is no problem with a rating system if only you can see the results !".

Reality : in less than a week after such a rating system is included into the game, some theorycrafter find how the medals are awarded, all the unauthorized parsers are updated to calculate all of your team members ratings, and the results are uploaded on ff14ratingslogs.com to the whole world to see, leading to even more stress, dramas and toxicity than the current parsers XD