Most FF series has Libra spell, Why not FFXIV

[Amiantos]

because ffxiv is just a generic mmo with a FF skin? it is the same reason why anything that deviate from the prototypical theme park design is shunned and put on the backburner

FFXI didn't either so stop right there.

[Enkidoh]

FFXI didn't either so stop right there.

Actually, Libra was added into FFXI eventually in a patch - it's a White Magic spell for SCH. However it doesn't work the same way as it does in earlier titles (it's just a spell for viewing a target's enmity level - as ARR already has enmity gauges by default anyway Libra would be superfluous if it made this way.). Really, there's little need for Libra given the fact target weaknesses are minimal, if not non-existent, and most of the other relevant information is already shown on the screen anyway.

[Tupsi]

FFXI didn't either so stop right there.

Scholar has Libra ability that as said was a scan like usual but only for enmity levels. Scholar in XI that is, since yeah, Scholar in XI at least attempted to be the same Scholar of FF.

http://wiki.ffxiclopedia.org/wiki/Scholar#Job_Abilities

But yeah, this is a generic MMO with FF skin, don't expect the class/Job system to really be much of anything other than an illusion at this point.