My quick 2 cents~

I hate this idea. I spend a lot of time teaching new players Ifrit, Moogle, Darkhold, etc. And since these are new players, its doesnt always go so well. XD Which I dont mind! I like the excitement of the fight being challenging because the players are new! And seeing them get all excited when they win for the first time or get their first Ifrit weapon, I just love it! It breaths new life into old content. Having beat these primals more times than I can count with pros, its refreshing to play with the newbies! ^.^

If the game had deleveling, I would be much less likely to help the new players for fear of losing levels from the inevitable deaths associated with people learning these fights. Deleveling would further separate the veteran players from the new players.