The fundamental tension in isekai is not found in power levels, but in the conflict between the desire to optimize a world and the necessity of suffering within it. Comparing a YPS-7 law-rewriter to a YPS-4 narrative looper is a category error; one operates on the physics of the world, while the other operates on the timeline itself. The real divergence lies in how these characters handle agency. Rimuru represents the efficiency fantasy. Through the consumption of the Orc Disaster and the evolution into an Ultimate Slime, Rimuru treats the world as a series of logistics problems to be solved. By removing internal friction and moral darkness, Rimuru ceases to be a traditional protagonist and instead becomes a piece of administrative infrastructure. Their growth is purely additive, replacing chaos with a corporate-style federation. Subaru functions as the inverse: the endurance fantasy. His agency is not additive but subtractive, carved out of the trauma of repeated deaths. While Rimuru optimizes the system to eliminate pain, Subaru uses pain as his only reliable data source. The narrative weight of Subaru's bonds is earned through a moral cost that Rimuru never pays. One builds a paradise by erasing the possibility of failure; the other finds meaning by failing until the world finally yields. This reveals a core truth about the genre: when a character reaches the scale of a YPS-7 world-ender, they often stop being a person and start being a government. Subaru remains human precisely because he is trapped in the friction of a world that refuses to be optimized.