The build signifies a near-final version of the operating system update, issued to developers and public beta testers for final evaluation before general distribution. It is intended to identify any remaining critical bugs or performance issues that were not caught in earlier beta phases. For instance, developers will install this version on their devices and test their applications to ensure compatibility.
This stage is important because it offers the last opportunity to address potentially widespread problems before millions of users receive the software. Successfully completing this validation means a smoother upgrade experience, reducing the risk of negative feedback and support requests post-release. Historically, this pre-release build has been indicative of the features and stability users can expect in the upcoming public launch.