"You cannot Special Summon or activate monster effects until the end of the Main Phase of your first turn."
Konami didn't implement this when they nerfed Duel Standby, so that people abuse Amano Iwato.
Very clever.
"Still cant get how triamids still activate their effects in main phase 1 although they uss balance."
Did you mean Triamid Hunter? Its extra normal summon is continuous, not an activated effect.
On the other hand, with balance skill, Triamid Dancer cannot activate its effect during 1st turn.