going +1 of off a blind draw simply isn't powerfull enough lose out on being able to open hand traps which is already pretty good going first and absoloutly crucial to be able to play going second
you actually want the serious explination? then i gotta ask, are you fammiliar with the theory behind why upstart goblin is bad? because it's basicly just an extension of that and i'd like to have to explain as little as possible