With airliners it is all over the place. In a 737, not trimming might result in forces that are not
With airliners it is all over the place. In a 737, not trimming might result in forces that are not controllable due to mechanical linkage. If your engines are under the wing, you theoretically also need to trim out thrust moment changes. In pure hydraulic planes it depends on design. In the 777, you trim for speed but not for thrust. In the MD11, it will automatically trim away small forces but not large ones. And Airbus FBW involves no trimming while flying at all. Any planes that are pure hydraulic will not feed back aerodynamic forces, but usually implement some kind of spring rate that depends on indicated airspeed (even with unreliable airspeed).
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