Ruby on Rails 6.1 now includes support for rendering objects that respond to `render_in`, which facilitated the development of ViewComponent, a framework for building encapsulated views. Unlike traditional Rails views, ViewComponent allows for isolated, reusable, and testable view components by executing templates within the context of the ViewComponent object, thus encapsulating their state. This encapsulation addresses the challenges of shared state in Rails views, making them easier to reason about and test, drawing inspiration from component-based UI frameworks like React. ViewComponent has been significantly integrated into GitHub's codebase, resulting in faster, more efficient testing processes and reducing test duplication, while also promoting a consistent and maintainable UI architecture. The framework enables developers to write unit tests for view code directly, which are considerably faster than controller tests, and has been instrumental in standardizing UI patterns, leading to more consistent implementations. The introduction of ViewComponent is part of GitHub's broader contributions to Rails 6.1, which also includes features like horizontal sharding, strict loading, and template annotations.