Considering that nekker decks usually pack a whole swarm of them, the tempo you lose can range from minimal to game changing. Sure it turns an 11 power into 2. It also stops the player from summoning any of his other 2 - 6 nekkers which are sitting in his deck, with STR 10 or more. Not even with Slyzards, and the summoning circle will at best spawn a base copy.
Not being able to kill golds is not really important aside from Eggebracht, which is the only gold that Scorch can get rid of without AC being able to. Golds have lost their immunity, and there are not many strong golds in the game, they mostly rely on their abilities to deliver. And the 2 power body is negligent to say the least