In modern space sims control is becoming more complex than
in traditional atmosphere-based flight simulations,
with many more inputs required to achieve true control of the space craft.
Pitch, roll, yaw, backwards, forwards, up, down, left and right (the titular 6DoF) all need to be accounted for.
This is why the new mini analog sticks are required; providing four more axes of control.
Assignable to any in-game axis function, or programmable using the included software, running out of control options is no longer an issue.