Feels like light attacks are more viable than heavy and because of the damage(for me), it is better to spam it especially when ubi feels like light attacks need to be faster and make that two lights most of the times has the same or more damage than a heavy attacks, why don't make all lights faster but make all damage the same(10-15) while heavy attack damage is(30-45), and faster lights mean less damage since it will hit more, unless your opponent guess right but killing your opponent with lights will be slower.