Minecraft is a phenomenon more than a game. It’s been out for so long and been played by so many that it's usually described as the sandbox creative game where you can build anything. The sense of mystery surrounding the game's world and sights has long since died off.
After over a decade of updates, wikis, and YouTube tutorials, the Overworld is completely figured out. Players know exactly how to strip-mine for resources, how to automate farms, how to perfectly space torches to prevent enemy spawns, and even how to end the game in record time. Exploration is unnecessary outside of finding rarer blocks for building projects.
Mojang has been trying to bring back these lost elements in recent updates, hoping that players would leave their bases to go further into the unknown and discover fresh biomes and structures.
However, these smaller additions don't add enough spice to the mixture, especially when the game can only generate the new stuff outside of already explored areas. Mining for miles just to find an ice cave, then trekking back, doesn't really sound that appealing. The alternative is to start an entirely new save, but that isn't viable for every update either.
The Sift is the best chance Mojang has to recapture the magical part of exploring the unknown in Minecraft. This dimension is a blank canvas for the studio to experiment with. Best of all, portaling to a new realm fixes all the travel and new save issues.
It can have different rules of biome generation, animals, enemies, dangers, or even physics differences. Minecraft Dungeons II gave a glimpse at what the new dimension will look like, but the base game has the chance to scale things up much more. Having that feeling of holding just a sword and a pickaxe, staring out across an alien terrain with absolutely no idea what to do and where to go sounds intoxicating.
By letting its fans return to experimenting with new ores, observing the new mobs to see if they are friendly or not, or crafting all new kinds of tools, Mojang has the chance to revitalize the entire game for both newcomers and veterans in one swoop.