This is how it works:
The trailing axles are behind the "real" center of the kinpin. And that will force the wheels to turn outwards (left to left, right to right), keeping them very tight & stable. Since they are "pushed against the steering rods". When checking toe-in (or out) you should always roll the car forward a little to see the "tru toe".
With inlines there's no stabilizing effect. It's wobbly wobbly...
(Correct me if I'm wrong)
But does it really steer more? Isn't it just quicker steering "reaction"?