Why Real Software Systems Must Evolve: A Guide to LLD Domain Modeling

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In low-level design (LLD), real-world systems never remain in their initial state — they continuously evolve as business rules change, scale increases, and new edge cases emerge. Design drift occurs when the original model no longer matches current business needs, causing logic to leak across boundaries and quick fixes to accumulate. Refactoring is not a sign of poor design but rather a necessary process of realigning the model with business reality. Experts recommend isolating invariants, defining clear ownership, and separating bounded contexts so that changes remain contained and predictable. The ultimate goal of domain modeling is not a perfect initial structure, but a system that can adapt safely and evolve cleanly over time.

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