Does a biplane need wing twist? Does a biplane need wing twist?

I understand wing twist is used to:


creat a soft/partial stall ( hopefully create a partial stall before a full stall)
balance the wing so a smaller horizontal tail is needed with less drag.


So if the top wing on a biplane is canted upward, in a mild stall, it will stall first, with the bottom wing still flying, creating a partial stall.

If the bottom is at a lower AOA, it's like having wing twist on 50% of the plane. Wouldn't this act like wing twist on a monoplane and reduce the total moment, therefore needing less of a horizontal tail, like the self balancing wings on modern gliders. Is this correct, at least conceptually?
Evidently, they don't. The picture shows a fully aerobatic Pitts Special from 1966 with no visible wing twist.