World border can be important for custom maps in Minecraft. They are a way to limit the areas that one can get to. There used to be an "Old" map setting, much like the "Infinite" or "Flat" options ...
Just like all the rest of Minecraft, using commands has gotten simpler and more accessible with each successive version. Instead of having to pore over lists of ID's for your enchanting commands ...
Minecraft cheats and console commands provide a handy shortcut for those who wish to circumvent the resource grind. With the right spawn commands at hand, there's no need to dig deep for gold, iron, ...