I agree. Its first come first serve. If building a blind somewhere reserves the right for me to hunt there, I'm going to every lake in my area and piling up some branches with some twine to reserve my spots
I'm not a fan at all of permanent blinds on public land. Its public meaning everybody including non-hunters, new hunters, or old salts. I don't leave my climbing gear in the rock to claim a route next time I feel like coming out. Leaving a kid's pail doesn't claim the sandbox at the park for him. Pack it in pack it out IMHO. That being said, I have used a couple of perma blinds because they were where I wanted to hunt. One of them is my buddies but I walk away any time I see a random stranger in them as he beat me fair and square. But a permablind is not a ticket to reserve a spot. If I get there first or an area that's close to the blind before the blind hunter, that area is mine or we are both going to have a crappy hunting day unless they want want to hunt together (best option for them as I can't shoot to save my life).
One thing duck hunting has taught me is that in prehistoric time, I would probably be a gatherer.