Why do Pikemen have less strength then draftees

I have stumbled into what seems like a historical inaccuracy. The pikemen have a strength of 31 when the draftees have 34. If you see historical evidence, pikemen were very good against cavalry and any melee units. The pikemen having less strength than a melee unit is just crazy. If, let's say, you have a strength of 34 base but a +8 for being great against cavalry and a +4-2 for melee units, since they don't have shields, they should take more damage from archers as a balancing fix.