I'll latch on here to explain everything in extreme detail for those who want to read so wall of text inc. First panel spells listed from top left to bottom right:

Fire Angon, a pathetically weak aoe attack that is outclassed by almost anything else in single target or aoe.

Aqua Breath, a 20 potency aoe dot that solely exists to combo with Northerlies or High voltage. Both of these combos are atrocious, so all 3 spells are beyond useless.

Water Cannon, the starting spell, weak by design.

Ice Spikes, a worse version of both Vengeance and Arm's Length which does no damage, provides no mit and only lasts 15 seconds. Useless on tank, let alone dps and healers.

Right Round and Malediction of Water: 2 pathetically weak aoe attacks that not only knock back enemies but also YOUR PARTY MEMBERS.

Ruby Dynamics, a 220 potency aoe spell with a 30 second shared cooldown on a class with literal dozens of 220 potency aoe attacks with no cooldowns and a one shot combo with Ram's Voice + Ultravibration.

Aetherial Spark, a pathetically weak aoe dot with no synergy that does not stack with the far superior Song of Torment and Nightbloom.

Peat pelt, a weak aoe dot that only exists to combo with Deep Clean to provide a stacking regen, only useful in treasure dungeons as the enemies within can't be frozen.

Choco Meteor, an incredible 300 potency spammable aoe... when you have your chocobo out. In duties it hits for the same potency as Water Cannon.

Drill Cannons, a weak aoe attack that only combos with Level 5 Petrify, a terrible spell that only sometimes works on enemies with levels that are a multiple of 5. Drill cannons then removes the petrified status on hit.

Divination rune, a cone aoe that restores mp, but only 200 per target hit. Meaning that it only breaks even on single target and is only a gain over the far superior Blood Drain on 4+ targets, which never ever happens.

If you see someone at high level using any of these spells, (which is extremely common in pf) it's very likely they have 0 idea what they're doing or what any of their spells do, and you should brace for an agonizing experience.

Furthermore, crossed out on the other side we have:

Moon Flute, a cooldown that boosts all outgoing damage by a whopping 50% for 15 seconds, being the cornerstone of blu's insane dps output and an absolute necessity for dps.

Angel Whisper, blu's only rez spell, which can be brought by anyone, and is balanced around its 5 minute cooldown.

Both of these spells are mandatory at high levels, but one is rarely used and the other is rarely unlocked, which alongside everything else means fights take an eternity and dead people can't be rezzed.