Trust me, there are no BLMs that are thankful for the addition of yellow staggers to the game. I would much rhater someone tell me that don't need my BLM than tell me to come on BLM so I can "proc yellow".
Um, I am. I like that yellow procs give me an excuse to go BLM. I actually, God forbid, enjoy playing BLM
If you enjoy standing around to proc yellow, that's your opinion and I'm glad we have some BLMs that do enjoy it.
However, I don't. My definition of "playing black mage" was formulated nearly a decade ago... and "procing yellow" ain't it. I'm biased I guess.
Regardless of if you come to "proc yellow" or not, though, you still get access to your FULL line up of spells. Having to wait to Unleash Hell on the unsuspecting NM until after the procs are done goes for everyone fighting it, not just you. You at least get an "On" switch with no waiting.
If we come to "proc yellow", we either set all 8 spells (or some subset for how long we're going to be in there), wait until we hear the element and switch to it (with the corresponding 1 minute of down time waiting for spells to come online again), or we forgo switching around for the the spell and possibly missing yellow proc.
I don't know if they should necessarily give us access to everything completely out the door. Having our full allotment of magical spells, for instance, gives us a little too much. They do have a few options, though, that would give us more flexibility but also stop us from having full access to everything:
1) They could adjust recast and cast timers of spells not set. Doubling both of those would give a deterrent to wanting to use them when not set, particularly the DD. However, while being the easiest option, it still gives a lot more power to us.
2) They could decrease the potency of spells not set. If they ran off Blue Magic skill/2, for instance, that might adjust them a little bit and make them a bit harder to want to use. By decreasing the potency, we'll be harder pressed to want to use a spell, but the circumstances might make it nice. The upside, in particular here, is not having to set yellow procs. The downside is that they'd be much easier to resist, forcing BLU's to use M. Acc. gear to get them to land unless we're willing to set them.
3) They could remove or downgrade "additional effects" lines from spells not set. This is my least favorite option and doesn't even affect all spells, which means it's really the weakest option, as well.
In any case, only spells set with points would count towards job traits, as mentioned above.
The fluff also seems a little... draining. I guess I'll have to wait and see how powerful Meteor and Comet are, since in many FF's, those drain power from the person casting the spell and, theoretically, could (and in one case, did) kill the person casting it. If BLMs receive no drawback to these spells (short of casting time/mp cost), then, yeah, I'd say SE should at least consider giving us a new merit category at 99 that would allow us to use non-set spells, if not a job ability to do so.