The Short Version
Fitbit Air reviewed at $100 with 8-day battery and AI health coaching, no screen included.
Fitbit stripped out the screen and charged $100 for what's left: 8 days of battery and AI health coaching that doesn't compete with your phone for attention. Most smartwatches cost more and last two days, so the Fitbit Air's pitch is simple. You wear it, it watches you, and it doesn't need you to watch it back.