The platform should replicate the g forces not the orientation of the airframe. Say you swiftly roll your aircraft to the left to perform an aileron roll. The force you feel is the right part of the seat pushing into you. You will feel this as long as the roll continues because there is a constant force due to the rotation. This equates to the platform rolling to the right.
People understand this concept very well for surge - longitudinal - acceleration, where accelerating forward should tilt the platform back, but get confused in other degrees of freedom.
With this concept you can also replicate airframe yaw very well, since as the aircraft rotates around its center of gravity, you will feel a centrifugal force, rather than a rotation around your center axis. Such a force can be replicated with pitch and roll movement of the platform.
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