Being "slow" doesn't make a Weak Armor boost crucial, it simply makes Weak Armor shine and truly give a reward for taking a hit. Being slow (71 base Speed for my spread) still outspeeds Ferrothorn, Gastrodon, Forretress, Chansey/Blissey, Jellicent, Tyranitar, Politoed, and Skarmory, and allows us to put more raw power into both attacking stats and stay within the limits. This will let CAP4 moonlight as a great mixed wallbreaker using either Illusion or No Guard, but still be capable of being a viable, all be it risky, sweeper with Weak Armor.
...Take it higher, take it higher, 'til the roof is on fire. Take it higher, take it higher, let's burn it up...