Why really?? How does it hurt you personally?
Will no one play with you so you cant take advantage?
Did/Do you have lots of free time so you can spend hours a day levelling?

Levelling is not an Important Part of an F'ing game, Its just a time-sink to allow Dev to avoid making more content and for company's to get more money in subs...
Some MMo's Have lots of quests to level with, in those its kinda fun to level.
In FFXIV is just killing mobs over and over with minimal or no reason other then levelling up...

An No It's not an exploit, go an learn what it means then come back
As if it was an exploit any dev team would have hot fix'd it by now,