Hello @tmerrill and welcome to the Community. All users, both Mac and PC, can see and work with their data on their web dashboard at fitbit.com. You can do this with any web browser. If you are asking for the ability to sync with a Mac, that is a very different story. Fitbit Connect was deactivated last fall -- but Fitbit stopped making trackers compatible with Fitbit Connect in 2019.
Fitbit has been evolving to favor the app for years. All of the newest features, like the Health Metrics, are on the mobile app only. This evolution started a long time ago. You can see your sleep stages, but the web dashboard doesn't have your Sleep Score.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.