Main reason why IAP isn't particularly useful is because it lacks a hitbox in the last 1/3 of the move. It has pretty laggy startup and has to be used near the opponent, it's not particularly safe to be used at this range. Doubt they'll end up changing this to match fox's hitbox.
As a side note, I wonder if IAP OoS can punish anything on shield that is normally unpunishable?
As a side note, I wonder if IAP OoS can punish anything on shield that is normally unpunishable?