What is "aircraft stability" - IN VIDEO

[Crumpp]

i could learn to fly with that, if my stick didnt have a center spring

Relaxed stability aircraft have artificial means to impart feel for the pilot like a center spring.

Would not be any different with your desktop joystick dealing with the instability of the early mark Spitfires.

You would have an advantage the real pilots did not have but it would much more realistic than having a FM that is static and dynamically stable.