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I don't think Entity-Component-System is Unity-specific. From what I recall from other articles, Unity has its own idiosyncratic implementation, but the pattern has several slightly different interpretations.

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Correct, the first game to use ECS was Dungeon Siege back in 2002: https://www.gamedevs.org/uploads/data-driven-game-object-sys...

Dungeon siege used an "Entity/Component" framework. That's a very different thing to an "Entity/Component/System" framework.

This is correct. It's a general pattern widely used in game engines and some other areas; not at all Unity-specific.

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