When drawing a parallel between two things, they need to have something in common. It doesn't mean they have to be identical in every point. Hazy Moon and Snatch are similar in that they absorb power, but the power is then distributed differently. There's enough differentiation between the 2 abilities that it doesn't feel like a cheap copy of Snatch, on the contrary. Imo it could be a better, more versatile ability.
Well if we're going to judge abilities in terms of uniqueness, then a lot of abilities would be considered trash, even the most powerful ones
Even Tristan's could be trash based on the fact he's half goddess half demon, and we've already seen those powers ad nauseam.
I think what a lot of people fail to grasp is that it's not about how unique or powerful an ability is, but really how the user can get the most out of it, and the multiple applications he has for it. Even seemingly "weak" abilities like Donny's turned out to be quite amazing once he figured out how to use it.
And still Ban needed his sacred treasure in order to bring the most out of his ability in the final arc.