I know this sounds like a QQ thread and it is in a way. It's moreso that I would like a developer response, and since it deals with two jobs I don't think it belongs in either of the separate job forums.
This thread is not just "QQ over THF" but it also addresses problems with DNC. I am a fan of both jobs and would like them both improved. I will speak mostly regarding THF since I am and have been a passionate THF for a decently long time and my love of DNC is mainly from playing with good ones and not playing the job myself.
SE always seems to fear THF as a DD. Where they are happy to throw DD buffs and incredible power (see: Ukko's Fury, Victory Smite etc) at already extremely strong DDs, they are extremely hesitant buffing THF, often adding utility tools at best (doesn't help that they're often useless too - see Despoil).
Any career THF's greatest hate is the feeling that they are essentially there to contribute Treasure Hunter and nothing else. With the advent of great Atma and the general power of the 1handed DD in Abyssea, this has greatly diminished but as we move outside that realm once again I have some doubts that it may return. I would like to bring up the following:
Dual Wield: DNC was given high native Dual Wield and THF was not. Along with DNC's other DD advantages (Saber Dance, more Dual Wield gear) there is a considerable difference between a DNC and a THF's DD ability. This is silly when you consider the fact that DNC provides a level of support and a BRD-esque Haste buff while eclipsing THF's damage output. Instead of nerfing DNC's, I would propose that THF and DNC be given equal Dual Wield with NIN having one tier above.
Another large problem with THF is that it is largely passive. DNC has Violent Flourish and (although much weaker) Animated Flourish which allows it to control the course of a battle and/or get attention quickly if necessary. THF is forced to either hope Accomplice/Collaborator do something or melee for damage and although many jobs do not have a source of Stun and so perhaps THF does not deserve one, one should never underestimate the power of a Stun ability. Although I lack a suggestion, it would be useful if THF had some method of controlling a battle if it goes downhill quickly.
Speaking of abilities, THF has no defensive JA. We basically stick on Evasion (which is very nice, don't get me wrong - but an 80% upper cap is a bit restrictive; maybe raise that, even if only specifically for THF?) and hope for the best. DNC has the aforementioned Stun, high evasion, Fan Dance for extreme PDT and cures on top of that. It would be greatly appreciated if THF had something like "Perfect Evade", similar to how MNK gained "Perfect Counter" recently (although I'd like to re-emphasise - 80% as an upper cap is quite low (by design?)).
Finally, critical hits. You have recently been giving THF a Critical Damage Bonus trait, which I approve of and feel is a very good way to improve the job. However, you've then given (I'm only mentioning those you would use in a top-end gearset, and only those THF cannot use);
Kamome - NIN: +10% crit damage
Iga Eramaki - NIN: +2% crit damage
Charis Feather - DNC: +5% crit damage
Ravager's Calligae +2 - WAR: +10% crit damage
Lancer's Cuissots +2 - DRG: +10% crit damage ~ but since this is WS gear only, I will ignore it.
THF and DNC both have +8% at max level, meaning
NIN has 4% more than THF
DNC has 5% more than THF
WAR has 2% more than THF (WAR has +5%, and then -5% for the Loki's Kaftan difference).
This just increases the gap in damage between these jobs. If you want THF to be an expert at critical hits (which I would say is a good way of buffing THF, given SA and TA along with low Attack which needs criticals to increase damage significantly), please make us experts at critical hits. Another trait or two would be very welcome.
Now a quick note on DNC's behalf: shared Waltz timers have to go. DNC as a healer is pretty crippled at the moment because of the obscene Waltz timers, all sharing the same timer. Perhaps if not individual, at least separate them into Waltz(healing) and Waltz(statuscure) or something similar.
Yes I know, long boring QQ thread. I just wish to bring these matters to the attention of the dev team, and so thought to compile them here. My intention is not to make THF this unstoppable titan of damage, but instead to firstly not feel inferior to DNC in all ways but Treasure Hunter and secondly to feel like I am honestly contributing something great to a fight. That if a given mob did NOT need Treasure Hunter, people would still be happy to have me along. Feel free to leave comments etc.