Fly 400 km/h IAS at 1000m alt. Trim the aircraft for level flight. Shortly apply rudder for 15° of slip and release. Try with a Spitfire of your choice, a Fw 190, an F6F and a P-51.
How often does each plane go back and forth before it stops oscillating?
How large is the first amplitude to the other side for each plane?
How much time is needed for each plane to settle back to a steady condition?
Do that and you'll see that the Spitfire is just as stable as other planes, it simply has more effective controls. It is possible to compensate for that with a proper joystick set-up or simply by being less ham-fisted.
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