[5] This makes it similar to previous macOS releases Snow Leopard, Mountain Lion and El Capitan.

In High Sierra, kernel extensions ("kexts") require explicit approval by the user before being able to run.

The ability to lock screen using a menu bar shortcut activated in Keychain Access preferences has now been removed.

[17] The 10.13.4 update added support for external graphics processors for Macs equipped with Thunderbolt 3 ports.

[18] The update discontinued support for external graphics processors in 2015 or older Macs, equipped with Thunderbolt 1 and 2 ports.

Starting with 10.13.4, when a 32-bit app is opened, users get a one-time warning about its future incompatibility with the macOS operating system.

[19] Apple announced the original Final Cut Studio suite of programs will not work on High Sierra.

Media professionals that depend on any of those programs were advised to create a double boot drive to their computer.

In High Sierra, Siri uses a more natural and expressive voice compared to previous versions of Mac OS X.

[30] The release of macOS High Sierra 10.13.5 (and iOS 11.4) introduced support for Messages in iCloud.

[33] Roman Loyola, the senior editor of Macworld, gave High Sierra a provisionally positive review in September 2017, calling it an "incremental update worthy of your time, eventually."

that the WindowServer process had a memory leak, leading to much slower graphics performance and lagging animations, probably due to some last-minute changes in Metal 2.

Alban Rampon, the Senior Product Manager for DisplayLink, stated on December 24, 2018, that the company was working with Apple to resolve the issue.