This thread was only created by two reasons. Either wasn't invited to experience the advantage of exp chaining or feels the need to express getting Lv 50 is some sort of relic sign on FFXIV.

It's not an exploit because the system is working as intended. When having a low level player in a high level players in a party it will mean that the first kill will be high exp for the low rank and low exp for the high level party. When chaining, both high/low players are rewarded with a set of amount of exp appropriate for the level. Example: 900 for a R20 and 560-680 to a R45 player.

People feel the need to complain to make the game a competition.