It's easy enough for a server which wants to provide some sort of "easy viewing cool builds" functionality to do it multiple ways such that something native would only be a minor convenience and many would still just use the more customized methods anyways.
2b2t wants to provide a certain anarchy server experience which would not align with that kind of functionality, spending quite a bit of effort in the opposite direction really, so this project is more about fighting to do cool things on the server than it is about dealing with Minecraft limitations.
Yes, the anarchy and inability to truly protect anything is part of the appeal of 2b2t.
There was an interesting base project wherein the true coordinates were only known to the top leaders. All other builders connected through a custom client that offset the coordinates to hide the true location. If anyone became untrusted, they were simply blocked from the client and could not expose the coordinates. There was care taken to ensure the area outside the proxy was never shown, block place directions were randomized to prevent reversing the proxy, etc.
The base apparently thrived for months or years before finally being discovered and destroyed.