The most dangerous phrase in software development is "we might need this feature later." I’ve spent too many years watching developers build complex, abstract layers of interfaces and factories to support a hypothetical scale or a pivot that never actually happens. This "speculative generality" doesn't make code maintainable; it makes it an impenetrable maze of indirection that confuses every new engineer who joins the project.
True maintainability isn't about building a system that can do anything; it's about building a system that is easy to change. The cleanest code is the code you didn't have to write. By adhering to a strict "YAGNI" (You Ain't Gonna Need It) philosophy, you keep the codebase lean and the cognitive load low. When the requirement actually changes, a simple, decoupled design is far easier to refactor than a complex, over-engineered framework that tried to predict the future.
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