Not got experience with those breeds myself but any working dog or livestock protection dog I fully condone cropping for.
Can save the dog from a nasty injury in the long run.
My experience is with Tradional working line English springer spaniels whom are sadly susceptible to badly injuring their tails especially in gundog work.
My own boy has a 1/4 docked tail which is the legally allowed amount unless injury is sustained where I am.
I have a prime example of the illusion a stack creates. Probably a lot actually. Notice it a lot in Margo's protection videos. When she is standing close to a 3 point = curve. When she isnt = straight.