Required Class/Rank failed - Can we have Optimal Rank and Favoured Class back?

[Jennestia]

I keep seeing people say this. Could someone enlighten me as to what AF gear is supposed to be? I can't think of anything in the game that it would stand for.

Artifact Gear -

http://wiki.ffxiclopedia.org/wiki/Gallant_Armor_Set
http://wiki.ffxiclopedia.org/wiki/Valor_Armor_Set
http://wiki.ffxiclopedia.org/wiki/Creed_Armor_%2B2_Set

Gear designed specifically for the job(s) in question.

Which they already stated would also be coming.