I'd change that to be "All your attacks with piercing weapons", for added complications (and realism).
And yet bludgeoning implements were used to great effect in the final stages of the medieval arms race because their effectiveness was so much less diminished by the wearing of armour as compared to slashing, chopping, and even much piercing, weaponry.
More to the point, neither 'added complications' nor '[added] realism' are legitimate goals
in their own right when designing stunts in this system.
Reaching a minimum level of 'complication' or 'realism' are legitimate goals in their own right, but simply more of either is not. You'd first have to reasonable establish that either of those facets of a stunt falls short before advancing it becomes a legitimate goal.