Google has agreed to include options for left-handed people to wear Wear OS smartwatches on their right wrist. The issue, which people have logged for years in Google's Issue Tracker, may only be available 'on future devices' though, for some reason.
https://www.notebookcheck.net/Google-confirms-that-it-will-finally-be-more-accommodating-to-left-handed-people-with-Wear-OS-change.592530.0.html