Well Nick, I respectfully disagree with you on all counts. First off on the sanctuary, do mallards, teal, wood ducks and the other puddlers seek open water for sanctuary? I submit that they don't they hide in the marshes, their natural and preferred habitat until the marsh hunter push them out. True the Blue bills, Cans, and other divers prefer the open water but they don't stick around a lake very long even if there is absolutely no pressure for they are on the move and if it's the 15th of the month they are at this lake and the 20th of the month a lake 100 miles away and so it goes until they are out of your state. If you want sanctuary for the puddlers, limit long or short tail surface drive motors that allow everyone back into the normally inaccessible parts of the marsh. Watch a large body of water and the movement of birds when the open water hunters are out there. It doesn't take the ducks long to figure out that something is up - but if the food is there they will only move on when their internal calendar tells them it's time. The only place I will agree that ducks should not be hunted in open water is on the Mississippi River as there are so many protected areas already that even the bank or marsh hunter are having a tough time - the ducks learn within 3 days to stay in the refuges. Open water hunting would make that situation only worse.
How would you like 1/3 less marsh hunters in your marsh? Open up the open water and you will. Every layout boat requires a minimum of 2 guys and many times I have three. Sure, there are going to be some times when crowding occurs, you already said it happens in your marsh already. From what I have seen in other states, layout hunters are pretty respectful of others and try to find their own part of the lake because they don't want to be on top of someone else as much as not wanting someone to encroach on them. Take a look around at the rest of the country and see how many problems they have with open water hunting - very little. You will have your work cut out for you because EVERY STATE except Wisconsin and Minnesota allows open water hunting. You may have specific situations that need to be addressed but why condemn the whole state because a couple marshes have crowding problems. Other states have addressed those concerns with draws, limited access, etc. We are losing habitat and hunting areas every year. It's no wonder that marshes are getting crowded, yet the DNR and DU are on a constant effort to recruit more hunters. Where are they supposed to go?
In addition to the above, the partial concealment law is ambiguous and open to a wide range of interpretations. In one county the judges are sympathetic with hunters and view one piece of vegetation as partial concealment in another it's 50%, etc. How are we supposed to be legal? It was bad law when it was enacted and is bad law now. The current bunch of "clarification" pictures and text is a like a bandaid for a heart attack.