macOS 27 Golden Gate marks Apple's first major upgrade to Apple Intelligence in two years, making the AI features mandatory and impossible to disable. The release combines significant AI-focused changes with incremental system improvements and design refinements. Golden Gate also drops support for all Intel Macs, requiring Apple Silicon processors.
As of macOS Tahoe, manually copying login keychain files between Macs no longer works on Secure Enclave-equipped machines. The metadata and secret keys used to decrypt keychain contents are tied to the source Mac's Secure Enclave, making them inaccessible on the destination Mac even with the correct password.