So many people need Add-on's in the games they play. From an Auction House tracker, a spell timer and warning system, to an automated node filled mini maps that show where all the farming locations and unveiled map before you even explore the section you are in.
Is there any word on if Add-ons will be allowed in FFXIV? Personally in WoW I went several years without using them, but after trying a few I realized just how much they could help (even if some were unfair in terms of PvP or exploration.) People also become dependent on them, IMO losing some of the skill needed to play the game.
In terms lets say you research each AH for several weeks, looking up and writing down crafting materials, list the items at the average selling rate only to find out that your friend DLed a program that in 2 minutes to install just did the same work you spent weeks researching because it was in a database so no real work done on his part or anyone besides the causal gathering of info from multiple users. He (or She) then cut your prices by 8% and sold everything while yours expired.