Less is more is exactly the opposite from my experience hunting late season birds.
I made a generalization from 20 years of hunting the Northwest mostly on public land and 8 years hunting the Mid-Atlantic all on public land. Your location and conditions may have different requirements for seeing cupped wings. I am used to hunting pressured birds that have been squawked at by lots of other people by the time I see them. A couple soft sequences are all that is typically required in my areas.
If you are proficient with a call you might be able to work them very successfully in the late season. But if one is STILL LEARNING then he need not blow his chances by haphazardly overcalling to educated birds. Hence the reason for the statement.
