Immutability - Not a Universal Law but a Trade-off

Introduction Immutability is often presented as a best practice: once data is created, it is never changed. Instead of modifying existing data, you create new versions. That sounds clean, predictable, and safe—and it often is. But treating immutability as a universal rule leads to overengineering and unnecessary complexity. Like most architectural decisions, immutability is a trade-off. This post explores where immutability shines, where it hurts, and how to apply it pragmatically across differe