I meant the identity of blue mage in a larger Final Fantasy sense and not just in the xiv bubble.
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Give a totem thing at the lv70 job quest which unlocks a soul steal kind of move. It procs when the enemy has less than 10% remaining HP, does some dmg and greatly increases the chance of learning a spell from that enemy. By 70, Blu will also be OK to solo a lot more content including the ARR extreme primals.
I think the best situation we could hope for is Blu catching up to the same level cap as other jobs so it can do current content (premade party) but just block the current raid tier from allowing limited jobs so they aren't unbalanced by raid buffs like peculiar light.
That way you can keep adding strong moves to Blu with a disregard for balance without breaking raids. When a tier is old and has echo, remove the limited job restriction and let people use Blu there if they want to. And Ultimate raids can just permanently have the no-blu restriction to maintain challenge.
If we're going to go this route, then the devs need to seriously make a decision. Either every caster gets raise and it's based on the role itself (yes, even BLM), or no caster gets raise. Having a wishy washy state on something otherwise unique to the caster DPS role isn't healthy for the game's overall design. I personally err towards giving every caster raises, just making them very unique and limited so it's a "once per 2 minutes" type thing instead of "You get a raise, you get a raise, and you get a raise! Everybody gets a raise." That I don't think is healthy. But it can be a raise that doesn't give weakness because it's highly limited, so healers can chain res, casters can res and preserve DPS/stats.