Boost-AGI+Auspice is hardly useless. It's used quite often, especially in low-man situations where the goal is to avoid feeding too much TP to mobs. If you're not seeing big gains from your Boost spells, try capping and meriting your Enhancing Magic skill, use /SCH for Light Arts and stack as much +Enhancing Magic skill equipment you can get. You do know that Boost-STR, DEX and INT are coming, too, right? While not particularly useful inside of Abyssea, the Boost spells are still useful anywhere else.
They shouldn't stop at just boosting the generic stat-line, though. They should add Boost spell that increase accuracy, attack, evasion or whatever.
What really sucks is only being able to use one Boost spell at a time. Being able to use two at a time would be so much nicer.
I do agree that the Bar-status spells are still pathetically unreliable. I try to be a decent WHM, but there's just no point using them, even with capped Enhancing Magic skill.
Haste II or, better yet, Hastega would be a God-send.
Replace Shield Defense Bonus with something useful. Another tier of Magic Defense Bonus, I don't care.
Make Afflatus Misery on par with Afflatus Solace. Afflatus Misery should be able to "store" damage taken for more than one hit, as it currently does... which is totally lame, by the way. Cura III could be added without breaking the game and, if potent enough, could make taking the damage worth the payoff.
Could add Bardarkra/Barlightra? They don't seem game-breaking but it just seems odd that WHM hasn't already been given access to these spells. A different kind of bar-spell that occasionally absorbs magic damage of a particular element would be neat, I guess.
I'm all for adding abilities or traits that would enhance WHM melee potential! Just some ideas off of the top of my head.