I'm playing this deck and I would still play it when it got nerf out of meta. It's a matter of likeness not usefulness. I would be glad when it got nerf and people stop playing it honestly.
Good luck playing harpies when they get darklord, shiranui treatment.
I also liked the harpies since I began yugioh tcg. I was waiting for some good support in dl for ages. But ofc konami just did the same miserable mistakes (see darklord, shiranui etc). Released ALL their cards TOGETHER instead of giving some of them. Who was gonna ever use harpist instead of the superior perfumer or channeler?
Harpie in duel link is by no where dark lord shiranui level and they are new deck when there are other deck with higher power level are out at that. The current meta is pretty balance with every of the meta deck having a high chance to beat harpie, unlike the other 2 decks metas.
in some cases you'll actually want them to release ALL their cards together, or at least release the next batch close to the first batch's release, otherwise you get unplayable junk like Dream Mirror, Rikka, and Melffy right now.