I don't frequent these forums much, but I have a number of suggestions I'd like to throw around and see if any stick with the Dev team:
Job adjustments:
MNK - They need a fTP increase on one of their WS similar to Savage Blade or Rudra's Storm where it can do very significant damage with high TP. Also maybe a better scaling of DPS with stats.
THF - Change JP category to be 1s off SA and TA instead of the DEX and AGI bonus, respectively.
RDM - Give them Haste 3, fully capped magic haste in one spell.
BRD - One of their JP gifts should be Honor Minne. It should give Defense, Magic Defense and Magic evasion, with a Gjallarhorn it should be between Dunna and Idris geo for their respective spells. The +defense should not stack with Mighty Guard from BLU. Increase the skill cap on their spells above its current 600.
DRG - Their pet needs more baseline DT.
BLU - Multi-part changes:
1) All their stat boosts from gifts need to be reduced. The job baseline is weak and gets stronger with equipping spells, as such it should start with low stats even with gifts. It should be a tier above WHM in melee and a tier above DRG in magic defenses.
2) Mighty Guard should overwrite cocoon. If MG is down via dispels, it can still be used as a defensive spell, but +75% defense is silly strong.
3) Mighty Guard needs to be AOE without the use of Diffusion. This really tears apart any job diversity as MG supplies 15% haste, allows a BLU to self-cap haste and then the party has to either bend over backwards to haste cap another melee...or just invite another BLU.
COR - At least A- Marksmanship...please?
RUN - Could we get a 1min cooldown ability that'll make the next rune enchantment give us 3 of that rune type?
Non-job specific Adjustments:
2h weapons need a better way to reach the delay cap than Hasso or Last Resort. RUN and WAR should not have to rely on subjobs to reach something as basic as attack speed in todays FFXI.
WHM and SCH should get Haste 2.
All melee aside from BLU (and RNG since they're at the higher tier) should get an extra buff to their accuracy from gifts.
Add secondary stats to the Domain Invasion vorseals. Regen should have hp++, Refresh should have MDB++, and Accuracy++ should have Defense++, maybe 10 defense per tier? Also the dragon should have it's magic attack and number of adds it spawns reduced if there are low numbers involved in the fight.
I think that's all I have for now. Thank you for your time.