That's like saying playing 3 cosmo brain is better than 1 cosmo brain with trick up the sleeve since you lose out on a skill and immediately tell the opponent what you are playing.
or destroying one of your backrows instead, harpies aren't strong beaters so summoning big monsters and not setting backrows is a an old technique to counter hunting ground
Well harpie Channeler is still missing and since XYZ is stil not in the game we lack powerful XYZ harpie supports like Number 11: Big Eye or Phantasmal Dragon