Familiar with that approach. My opinion is that single wing clip creates an imbalance and can harm the bird as crash lands. They are called flight feathers for a reason.
Yes, I have muscovies, chooks and geese and so makes sense with regard to the weight of the bird.
Only not all keepers have a take of and landing strip. Ha fun times chasing ducks that suddenly found their wings.
But this is chooks and backyard not my 6 acres, my mothers 110^2 feet. Six foot fenced.
We could run ropes to prevent incoming and outgoing. But at home, 3 foot electrified fence might keep the foxes out, but how does one keep the birds in?