i must say i have the same feeling that you on most you have said, but i want to add one thing, outside the low accuracy of the blue mage (probably link to the lack of int on the weapon)
the low damage of the whole jobs is concerning, right now needle make most of the leveling trivial.... but right now passed level 45.... needle is a junk. but on other hand the spell available are not strong enough for allows the blue mage to go in dungeon for get the spell it needed....


same like you have said, the blue mage is means to be a solo job.... but we lack a lot of skill needed for be a solo job. like dispel.... one more time the loose of vitality of the weapon is hurting badly... means any dot can be deadly really fast... in final fantasy 7 White wind don't only heal, it dispel too... i don't say to make it like in final fantasy 7, but i feel they need to add one spell for dispel like angel whisper!
same we have 3 spell that have no logic behind, self detonate, transfusion and last sting.... in solo this three spell have no logic... mostly because we lack a reraise spell...

the blue magic was extremely developped in the series, you have a lot of spell available and i found the spell list soo far quite lack luster... like teh fact that we only have 1 mono target spell for age... water cannon is the only mono target spell we get for very long...it work with a job like white mage that is not means to be a dps or to be played in team, but for a job like blue mage that is more solo oriented is not good.

by the way, some spell need an increase of potency really important.... blood drain is a junk skill, it give back almost nothing in mana and deal pitifull damage...

finally like you have said, the blue mage need true OGCD skill.... fast! because right now, i'm not concerned by the 50-60.... i'm dreadfull because it will be a nightmare to continue to level up a job that have soo many trouble in is toolkit...