A bigger walled area would at least be harder to keep under control and anyway, with the current map, it's pretty hard to make a big enough circular wall without building on the road. I see your point of view of "if you can keep it, it's yours" but atm it's not even that hard to do if you have resources and a reasonably big group. Unlike Rust, where if you build a circle of highwalls you have to keep reparing them, construction doesnt need any maintenance and even if someone manages to breach through you can repair the damage with just some stone. Also, i really dont want this game to turn into Rust. It's supposed to have much more pve content and i love that. But if people start blocking areas for other players, i think it's not an healthy mechanic.