The actual implementation is a little more nuanced than always roll or never roll, with seven conditions required to avoid coming to a complete stop:
1. The functionality must be enabled within the FSD Beta Profile settings; and
2. The vehicle must be approaching an all-way stop intersection; and
3. The vehicle must be traveling below 5.6mph; and
4. No relevant moving cars are detected near the intersection; and
5. No relevant pedestrians or bicyclists are detected near the intersection; and
6. There is sufficient visibility for the vehicle while approaching the intersection; and
7. All roads entering the intersection have a speed limit of 30 mph or less.
If all the above conditions are met, only then will the vehicle travel through the all-way-stop intersection at a speed from 0.1 mph up to 5.6 mph without first coming to a complete stop. If any of the above conditions are not met, the functionality will not activate and the vehicle will come to a complete stop