Choosing component boundaries for fast-moving product teams
The best component boundary protects a stable product idea while leaving volatile details easy to change.
A reusable component should represent a durable idea in the product, not every visual pattern that happens to repeat twice. The distinction matters because premature abstraction often makes ordinary changes harder.
I look for boundaries around behavior, content responsibility, and state. If those stay consistent across screens, a shared component can remove real duplication. If only spacing or copy is similar, composition is usually the simpler choice.
Clear boundaries help design and engineering work together. Teams can discuss the product concept by name, improve its behavior in one place, and still adapt the surrounding layout as new requirements arrive.