Eldain and Traps are so bloody powerful that all 8 participants in the Gwent Open brought it, but unfortunately, it got banned by everyone that we didn't see it getting played at all.
Or, the reality is, Eldain and Traps are mediocre that no one even teched against it and no one brought it. If you know that you are facing Eldain, it is very very easy to beat it. Eldain decks want to go to a long R3. In a short to medium R3, this deck can do nothing. They will try to bully you with committing Scenario in R1 for the tempo. But if you also commit your strong cards and even win with a card down and push R2, you WILLWIN.
You see, for Eldain to be good, the deck must have a lot of traps. If you smoke them out in R1 and R2, in R3 the ST bronzes are so crappy that they will have no chance to win. You see Dead Eye Ambush (or GT as there are some variants running GT), you push and win R1 and R2. In R3, even if you draw your junkest bronzes, it will be more power than anything the Eldain players can play.
But if you don't read the game and allow a long R3 against Eldain without smoking out most traps, I am sorry to say this and this is how strategy games go, the opponent deserves the win. I have been playing Dwarfs from R4 to Pro rank and I never lost a single game to Eldain decks. In fact, on rank 1, for the last few games, I was praying that I get matched against Eldain decks.
Now, lets assume you are a good player and know you are facing an Eldain deck and prepare to play against/around it. You can and will win 100% of the time (unless your deck is hard countered by Eldain - I can't think of any, but it is, that is tough luck). Now, you are facing Eist+BoG nonsense. You know what is going to happen. You know you can't win a long R3 and you know you have to push and get that non-sense out. So, you do it. The opponent commits his leader and Eist and win R2 with a card advantage and in R3, they stlll have so much fire power left. They throw Herald and all their bronzes play for 8+ points and you lose a miserable game.
I am afraid Eldain may get a nerf, but it is an undeserved nerf for an archetype which was just made playable couple of months back after couple of years of being dead. Are traps annoying to play against? So are a lot of decks. Mill, Clog, DoubleCross-4-times-Jouchin-nonsense, Anything SK, Eist-BoG, Viy, Arachas Swarm, Lined Pockets, NR Witchers. If annoying decks need to be nerfed, I would start with these.