Given that assaults, due to their high armor and low speed, are the most likely to draw fire from the enemy, it seems like you either need high skill pilots (to keep from falling over all the damn time) or long-range support designs, which get shot less and, thus, less use out if hardened armor. Most of the time, I hear hardened armor being championed for light 'Mechs with high speed. They miss the lost point of run mp less and they can get enough armor to effectively act more like a fast medium.