Cavalry probably requires a completely different play style. It is worth digging into. For example, we have to ditch the concept of "line". We have nothing to hold the line. We have also to ditch the concept of archer duel. Our Bow Cavalry will be shot to pieces. We have to learn to love bad weather, because the opponent gets tired and routs more easily on bad weather.

But early game we probably still have to get through with Ashigaru, and only after getting rich can we start thinking about an all-Cavalry army. All-Cavalry army probably require a lot of micro-management on individual units.