tl;dr
Sentinel is broken. Requiring gladiator leveled to 36 for Ifrit is a broken mechanic that is setting a dangerous precedent for future fights.
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Thank you for making Ifrit a challenging fight. When the servers and animation locks are fixed, I am sure this will be a thoroughly enjoyable fight.
Unfortunately, you need to patch sentinel. The XI purist community expects everyone to level gladiator to 36 for sentinel. This type of gameplay is pathetic, masochistic, outrageous, and classist.
I have no desire to play gladiator, nor marauder, nor pugilist. I am a fully dedicated mage.
One of XI's worst qualities was that you had to level X job for X fight, to have X ability. Leveling those classes took months. Yes the leveling curve is easier in XIV, but no, I still don't want anything to do with gladiator, marauder, or pugilist. I don't enjoy melee classes and I want nothing to do with them.
"But the armory system caters to leveling multiple classes." Yes, it does, and it rightfully should. Unfortunately, when you have skills like sentinel, that make such a dramatic impact to where guilds start demanding you level this class just for that fight -- you know it needs to be patched or something needs to be fixed.
1.2 is the perfect time to fix this horrible XI mechanic. I was denied several main missions in CoP because I didn't have the right jobs leveled or the right skills. XIV needs to move away from this terrible terrible terrible terrible design for future content.
I have been turned down by two linkshells who want me to have sentinel for Ifrit.
Furthermore, 1.2 needs to fix tanking to where you only need one 'tank class/job' leveled up to tank sufficiently. There is no fathomable excuse for the current situation to where tanks need to level gladiator, marauder, pugilist, and occasionally thaumaturge to be a sufficient tank!!!!
Having this 'requirement' to level multiple classes to be functional in dungeons or certain fights is ridiculous. The armory system is a perfect system to cater towards diversity and 'alternate character' play, but don't abuse it by requiring people to level. It also creates a massive barrier for newer players who want to pick up the game and say "I am going to be a tank!" Instead, they get faced with the reality of "no you cant, you need to level up four other jobs before you're good to tank."
The armory system is one of XIV's best and most unique qualities. I means I can take the spells I enjoy the most from the classes that I want to play, and have a personalized character. If you're going to start requiring people to level against their desires it really takes away the fun of the game and further reinforces the fact that this is nothing more than a grind-fest until you have all the classes leveled to start experiencing the game.
You shouldn't need every single class leveled to experience end game content.