This has already been posted by someone, however, I think I should repost it as it had suggestions that were difficult and didn't allow the exploration of Minecraft to happen.
What I think should be replaced is each biome has its own seeds to spread the biome that could be obtained through harvesting grass in the respectful biome. It would take a while to grow and would a certain amount of blocks for the biome. This would be perfect for the new 3D biome feature that came out in 1.18.
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