It would make string too cheap to get.
Wool is farmable from very early on, but spiders have to be fought against.
Unless you build a mob grinder. Which is still quite labor-intensive project with bigger resource prerequisite than a sheep farm.
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Totalitarian architecture. Angular, defensible masonry over sleek, sloped carpentry.
Taking it slow. Provoking into attack typically does better rushing.
Underground engineering. Well-lit tunnels are much safer and often cheaper than any surface construct.
Farmability. One of primary concerns relating to any feature.
Practical mobs. No annoyances taking up space and processor power.
Generalism and simplicity. Overly complicated and specialized concepts hardly ever come into fruition.