The simplification of code signing on Bitrise aims to reduce potential failures by merging functionalities into a single step. The new method allows for automatic code signing asset management, eliminating the need for manual provisioning profiles and certificates. Users can now choose between three automatic code signing solutions: Apple ID, App Store Connect API, and 'xcodebuild'. The process involves updating steps to newer versions, connecting the Apple Developer account, and enabling automatic code signing. For those who prefer not to use automatic code signing, an alternative method using the 'Certificate & Profile installer' Step is available. The old iOS Auto Provision Steps will be deprecated in favor of the new 'Manage iOS Code Signing' Step within four months.