Help me understand something.

I can see that "spring surge" is bad. (the Slinky effect)
I always thought that the inner spring(s) or the spring
damper controlled spring surge.
Not sure if "spring surge" = "spring harmonics".

Anyway, I keep reading that it is best practice to set up
the springs to be compressed down to .050" off of coil bind
at max lift.

Why ?

I would think that the less you compress a spring, the less
stressed the metal is. So, this would mean that at max lift,
you would want to be much farther from coil bind, .300~~.400
or more.

What am I missing ?