Rx.NET 7.0's package split is a significant update that addresses a critical issue in Windows application deployment. By separating UI-specific functionality into distinct NuGet packages, it reduces deployment size and improves efficiency. This change is particularly impactful for self-contained applications, which can now avoid unnecessary dependencies, leading to smaller and more optimized builds. The maintainers' approach to preserving binary compatibility while introducing breaking changes is commendable, ensuring that pre-existing code remains functional while preventing accidental dependencies on Windows UI functionality. The inclusion of an analyzer that detects affected source code and recommends the necessary packages is a thoughtful addition, enhancing developer experience and reducing potential errors. The decision to drop support for .NET 6 and .NET 7, while maintaining support for newer versions, reflects a strategic move towards aligning with modern .NET deployment models. The package split's impact on projects using the older packages.config mechanism is a reminder of the importance of keeping up with evolving best practices in software development. The future roadmap, which includes lower-allocation implementations, code generation, and potential support for ref-like elements, suggests a commitment to innovation and improvement. The release of System.Reactive 7.0 on NuGet marks a significant milestone in the project's evolution, and the detailed documentation on the Rx.NET GitHub repository ensures that developers can easily adapt to the changes. Overall, Rx.NET 7.0's package split is a well-executed solution that addresses a pressing issue in Windows application deployment, showcasing the project's dedication to modernization and developer satisfaction.