I can tell you when I shoot ducks on the water.
When I have hiked in 5 miles behind the hawke hills back home.
After about an hour of walking you have seen zero birds. From atop a barren you see a gully in the barren about a mile or 2 away. You get closer and closer. There have still been no ducks flying over head, as is normal.
For the last 400 yrds you crawl on your belly. When you're at the edge of the gully you see 4 ducks in the water. If they had seen you from 500 yrds away, they would have been long gone. But you got low and quiet, did your part, and they don't know you're there. Finally you jump up and shoot. The first one or two are usually done on the water and perhaps one while he's flying.
By now you hopefully have 2 or 3 ducks. ( a pretty good day)
You'll hike the 5 miles out with your birds and it was a good day.
Many will be impressed that you got any and just as impresses that you could even get handy to them.
Where I hunted most of my life, waterfowl was few and far in between.
Decoys and calling was not used, it would be useless.
Getting a few ducks or geese was a big thing, not whether or not you shot them on the wing, or whether some states in the US thought you sporting.
If the style of hunting that I employed for shooting ducks, which often meant taking them on the water, is what you call unsporting, then be careful... start throwing in baiting bears, stalk and hunt, sneaking in on deer that are bedded and giving a grunt to rise them at about 50 yrds, and so on and so on,