It isn’t absurd.
It’s the same reason that in DnD, Fireball is extremely overpowered. It’s part of the theme and what devs want from the game. Translating this to new world, when I think of wars, I instantly think of gravity well. I am pretty sure this is intended, the game needs GA as it is now in order to function, because it’s simply part of the heart of the game.
It’s the same reason when you think of healing, you think of life staff instead of void gauntlet. It’s an iconic weapon meant for healing. You could argue the same things you did for GA to life staff: Why it’s the only weapon that can reliably heal, or why is it getting buffs despite it being overpowered in terms of healing compared to other weapons (I wonder why that is, huh). It just doesn’t make sense to complain about it, it’s part of a theme, not balancing.
I don’t know exactly what you are comparing with GA/WH, what metrics and which weapons. But every weapon has its roles. You can’t compare Bow to Hatchet and argue bow is OP because it has higher range than throwing hatchet - their objective and theme are just way different to be compared in the first place.