Primary container enforces height constraints and prevents content overflow
The above is not a complete list, but it's enough to give some framing for understanding that X11 is a fundamental piece of most Linux environments.
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Why top-down? Every time you place a block, the heightmap (the “tallest solid block at each X,Z”) might need updating. If you build a tree bottom-up, every single leaf placement potentially triggers a heightmap recalculation. Top-down means the first block placed at each column is already the highest one. The heightmap only updates once per column instead of potentially many times. Small thing, but across thousands of trees during world generation, it adds up.
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