Hah. On 2b2t, an "anarchy" server where any player can blow up any build and type whatever garbage into chat they want, players often opt to travel out tens of millions of blocks in an effort to make their builds extremely difficult to find. Can take many hours of nether travel to get to where you want to go.

And inevitably, people still find them, usually through advanced techniques -- hacks that tell you whether a chunk is newly generated or part of an existing 'chunk trail' can be used to hunt down players that have taken great effort to hide their location.

Anyways, a distance of 10240 is just how this particular test was set up. The regionizing is still useful in a much cozier world.