I get syncing to any 3rd party service is clearly totally out unless I manually transfer the .fit file via USB and I understand why this would need their servers, although it would be good if the mobile app allowed transfer of these files, without requiring a laptop and USB cable.

There's no reason for the entire mobile app to be totally and utterly broken because their servers are down. There's a huge amount of functionality in there that should just work locally without needing an internet connection. I can't even set an alarm via their app without it needing an internet connection!?

Watch Face

1. Hold down up/menu

2. Hit start

3. Select Watch face

4. Hit start

5. Select customize

Alarms

1. Hold down up/menu

2. Click down to select clock

3. Hit start

4. Hit start again to select alarm clock

5. Navigate down to add alarm

I consider this a huge +

I'm fairly certain memory isn't an issue for my devices to continue collecting data, but there's no good reason to prevent Bluetooth comms between phone and watch when the internet is unreachable.

source: I use a Forerunner 945 for fitness & all-day tracking, and a Vivosmart 4 for sleep tracking

Try creating a relatively complex multi-step workout without garmin connect now that the old win 3.1 looking desktop app doesn't work anymore