Vivosmart 5 as Primary Wearable

If you removed the V4 T may be enough to default the V5 to the active device.

By removing I mean I took it off my wrist and laid it on the table. I did not remove it from Connect.

Taking the Primary device off at night and wearing the Secondary device because it is smaller, is what most of us are waiting for Garmin to implement, Maybe this is it. More people should test this.

Maybe it is, will check myself.
In other news, I accidentally wore both my Enduro 2 and VS5 during the same night a few days ago. Different sleep score on both :/
If your theory is correct, I do wonder if the calculations behind the scenes will also be, given this different sleep score, and even if Garmin factors the data from the device used for sleeping into the calculations used for the main fitness tracker.

Too many unknowns for my liking.

Actually I am finding a new issue. I tried to have the VS5 measure my HRV while sleeping. But the watch said: Please set your VS as your primary tracking device, that is tracking, not training! Has anyone seen this? On the Garmin Connect App or Web, there is no such things as setting a device as primary tracking, only Primary Wearable and Primary Training Device.

It really is a shame that they haven't figured out how to have body battery sync between two devices.  I sleep/run with my FR955, but use the VS5 during the day when wearing my mechanical watches.

Glad to see that I am not the only person, who cares about unified body battery. I am surprised that Garmin haven't figured this one out yet and hope that support will be rolled out in due course.

Answering myself with hopes that Garmin Development surfs by and acts on this. I have stopped using my VS5 as it do not offer the metrics it should (could), and as it also gives nonsense VO2max numbers as soon as I use it and synchronise. 

I am currently looking at the quite expensive Whoop, to get actionable metrics in a format (strap) that allows me to use traditional watches too. My Marq is used daily for training sessions. But it would be great to stay in the ecosystem of Garmin. They are missing out on an obvious opportunity here. It is only about pushing software to the VS5, and they can sell more of them.

Thanks for the info on Whoop. I have read reviews from DCR and the5krunner, and understood that the OHR may be the weak point. 

It is a pity, that there are no good options in a strap shaped tracker…

I think the current version (4.0) gets strong reviews on HR accuracy.  DCR still not a huge fan of the platform/closedness, but I think he said they have made good progress on accuracy.

the5krunner gives whoop a big recommendation.