I think the NO anchoring overnight, or NO hanging on a "Mooring" overnight comes from a simple reality. If people are given free and unregulated access to the lake...they WILL Take It.
Picture this: I live in the big city and it gets hot in the summer. I think I'll build myself a Barge with a "Cabin" on it ..maybe two stories high. I'll drag the barge up to Winni and launch it in June or so and tow it out to the nicest spot I can find and drop a large anchor over the side and ....
Spend The Summer.
It's like I have
Waterfront Property without the taxes and upkeep. I'll invite my friends up and they will see what a great idea this is and they will bring their own barge up next year....And so it goes.
Picture an
All Summer Long Woodstock '69 in Braun Bay. Hundreds of Tie Dyed T-shirts flying from improvised clothes lines on improvised floating summer "Homes".

NB