You guys are exaggerating the gear set difference between BLU and other jobs. Anyone who gear their job seriously would have all of the sets you listed for their job, whether it's BLU or not.
For example on COR I have all of the sets that you listed and more: varying acc levels of TP sets for both melee and ranged(low/mid/high acc). I have 4 different dt- sets(physical/magical/hybrid melee/status resist), I have 6 different ws set for COR 6 primary ws(savage/leaden/wf/last stand/req/evis), I have FC set for /NIN and /mage, enhancing magic skill set for phalanx, stoneskin set, healing potency for cure III/Cure IV for /mage, I also have macc set for light and dark shot.
Oh and let's not get into JA sets, QD dmg and QD stp sets, different variation of roll sets(pdt- hybrid, or mp+ hybrid so you don't lose as much mp /mage when doing rolls), ranged crit-hit builds, waltz set for /DNC, refresh sets etc etc etc.
Anyways, my point is that anyone that plays their job seriously, regardless of which job would have massive amount of sets, it's not BLU only. We just see massive waves of BLU players on the forum carrying that many sets because some of the most vocal players in NA community are career BLUs, so they advocate 400 million sets on their favorite job. But in reality you don't need THAT many gear sets(regardless of the job) to do events. Like COR only need leaden/qd/roll set to do endgame, BLU certainly don't need conserve MP for everything people bring BLU for....you can build one if you love BLU, but you're not going to see massive performance difference between a BLU with conserve MP build and a BLU without.
Despite I have that many sets on COR, I'm not going to pretend my COR massively outperforms bandwagon DP3 COR with just roll/leaden/qd set in endgame, nor tell people "you need every sets that I listed or else you suck" like some people here.