I think the reason -ga strikes are less in demand than -ja spells is because GPO's are used far more frequently and melees also tend to have way more options to equip than mages.
I rarely find myself equipping -ga (or even -ra) strikes now. Lifesiphon + Drain Strike is typically what my spellblades carry. The only time I'm going to differ from that is to hit elemental weaknesses. And I should note that I use spellblades religiously, I seriously take 2-3 to virtually everything.
I wouldn't break them down but I wouldn't hone them either. The only exception would possibly be if you have an elemental enhancing weapon/accessory, then it might be worthwhile to hone the relevant -ga as even unbuffed it's going to wreck shit.
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