Thank you SE for...

[ReiMakoto]

Snip of your list from earlier

Taking point by point

-Yes you do an LB 2 worth of potency, over the course of a fight, thats still a dps loss, I'm not automatically assuming its just how it works, even assuming you are raised instantly, those 2 mins of weakness will kneecap you severely, yes you mention phase transitions, phase transition mechanics exist on other jobs as well, just not as powerful as this one. Also There is nothing anywhere which is saying they needed these kill yourself abilities to be blue mages, that was a dev choice
-Im assuming you're talking about diamondback here, yeah 1 gcd, with a huge mana cost, and a huge dps loss, where you can't move. Yeah I can see your point, you could use it to cheese some mechanics, But other classes also do things to cheese mechanics all the time, it wouldn't be a BLU exclusive thing. Edit cos why not: You bring up specifically tank tethers, taking this raid tier as example why the hell would you want blu specifically to do this mechanic with diamondback in the first place, take chaos for example, taking the orbs, why would want your dps doing nothing to take an orb that a tank just brushes off and keeps dpsing through, or in the case of the tornado orbs, we just get a paladin to hallowed and take 2 of them, losing nothing, cheesing the mechanic. You already use bard to "cheese" the tether in omega as well (not to mention the hp down would hit regardless), and i doubt blu could take the multiple missles in panto 2 using diamondback. Just going through my memory of encounters in this game, I can't see a reason you would want a BLU to cheese a tank specific mechanic of that nature, over just getting a tank to do it.
-I would need to be on full health the heal everyone to full, assuming there is a mechanic that requires party healing, everyone has taken damage, at which point the healers will already be healing everyone up, with more effecient/ quicker heals, getting BLU to full for the blu to then heal everyone is just roundabout
-These skills don't work on any boss worth a damn, and the percentage likelyhood of hitting means that its often just better to kill trash than wait for it to proc, they are not broken
-Mighty Guard is just bad, you still take a fair amount of damage, and again mighty guard and white wind, cool, how much dps are you losing by doing these combo's, how much mana? On a class such as BLU where its personal dps is so low, can it afford to be wasting its mana and gcds away to pull off these roundabout tactics, which are just less efficient than the healer, you know, healing?
-Transfusion is pretty balanced, if you're in a situation where offing yourself to prolong the healer is necessary, you're probably not meeting the dps check anyway you know?
-Blu's dps is hella low, I've seen it myself 400-500 on a good day, thats abysmal for a level 50 dps. And yes peculiar light is probably too strong, but you know, it wouldn't be the first time square fiddled with vuln percentages.
-On demand -10%, cool. In most fights, reprisal or dismantle or addle can be up for nearly all aoes anyway, having bad breath be on demand does make it strong, but by no means broken, as you lose dps by doing it, and as mentioned, its dps is low to start with, can it really afford to lose more and still meet enrages.

In conclusion, its not totally balanced, I'll grant you that, but its still so very nearly there it would seem almost trivial to balance for DF if these were overall a bad thing. To take this list (despite me thinking they arn't too bad anyway) to balance this, Jack up the mana cost on white wind, give diamondback a cd, lower the potency on self destructs and peculiar light, ez.