Many organizations import external libraries for single functions, inadvertently increasing the code footprint of their projects. A library intended to provide one small utility can bring hundreds of additional classes, increasing build sizes and runtime complexity.
By contrast, a central in-house library allows teams to implement only the functionality they need, keeping modules lean and efficient. Writing new software with abstraction in mind enables reusable components to be added gradually, reducing bloat while maintaining a reliable foundation for all projects.
In my experience as a senior Java architect, I have rarely seen organizations take this approach, yet those that do enjoy smaller, more maintainable projects with predictable behavior and minimal unnecessary code.
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