lolganium is right. This isn't a new idea. We had T2Zapdos dealing 60/70 damage on T2 back in RS-On and HL-on. Back then, most basics had 40-50HP so 60/70 damage on T2 was like 70/80 now. It was decent, but it never rose to much success. Players had to have a late-game answer because many games would last that long to the dismay of the T2 player.
Then we had T2 Banette, being able to "potentially" do 90 damage on T2. Even looking at the most recent Banettes, with strength charms and jolteon*s allowing for a much higher potential damage on T2, games still lasted much longer than expected.
If you get anything out of this post, get this. Don't expect games to be over before the opponent can get anything built. It sometimes happens, and it often times does not. Be prepared for a long game and have a late-game strategy with the deck.
If you prepare for a long game and have a late-game strategy and the game ends early, your fine. But if you don't prepare for a long game and the game lasts past early game, your in trouble.