User blog comment:BlaZofgold/Buddyfight Theory - Adventurer/@comment-11372432-20140719224611/@comment-13275021-20140721142020

Link attacking is a minus in the sense that it forces out less cards from the opponent. If you have two monsters on the field with 7000+ power, and you can attack Duel Sieger twice, you force him to lose two soul (cards) in one turn. If you have to link attack, you force only one card to be lost. Therefore, it's a minus in the sense that the opponent pluses. Therefore, Adventurers have to make up for the -1 with their abilities to be worthwhile.

@Maddog98: The direct link attack rule during the first turn was changed with the new rules update. Since link attacks combine criticals now, link attacking first turn would be overpowered.