The (potential) benefits of FFB pedals can be summed up as
1.) Versatility
2.) Realistic feedback (where applicable)
3.) Haptic effects (for "immersion")
I can switch between sprung, hydraulic, free-wheeling programmatically
With MSFS (and I hope eventually DCS), for aircraft where it makes sense, the pedals will be floppy when cold and dark, have some resistance when there is prop thrust, and increase in spring resistance as the airspeed increases. They also react to slip angle so they are harder to push the higher the slip angle.
Ideally (though they currently dont), they would also reflect trimming action, both in FW and Rotor when applicable
And, who doesn't want their feet to vibrate when you BRRRRRRT in the A10?