Many modern apps (like latest Chrome, Microsoft Office, etc.) have dropped support for High Sierra. However, older versions of these applications, or specifically designed lightweight apps, still work. Spotlight/Alfred no longer finding apps - Discussion & Help
The 10.13.1 update continued to refine APFS performance on SSDs, optimizing read/write speeds and improving data encryption handling, while paving the way for eventual hybrid drive support in later point releases. System Requirements and Compatibility macos high sierra 10.13.1
: A frustrating bug where Spotlight would sometimes fail to accept keyboard input was resolved, restoring the efficiency of the system-wide search tool. Many modern apps (like latest Chrome, Microsoft Office, etc
: Added over 70 new emoji characters, including mythical creatures, clothing types, and more expressive smiley faces. System Requirements and Compatibility : A frustrating bug
Fixed an issue where was unavailable during Apple Pay transactions.