I went through a few rounds of changing how I use my Race S, which originally was 24/7 wear (outside of showering).
First, I took it off for “ambient day wear” but used it for workouts and sleep. I didn’t want to go through turning it off and on each time so instead just put it near the charger. However, I was concerned bustling of table (I have four cats) might keep trying to get the HR sensor to activate, so I switched off “24/7 heart rate”.
This was interesting as when I did so, it warned me it would need it on for sleep. So I went through a process of “workout, then when done turn off 24/7 HR” which turned off sleep, then go through my day and just before bed, turn on sleep, which turned on 24/7 HR again. As you’d expect, this made Resources even more useless, but Recovery seemed fine. It used my sleep and TSS data and just seemed to ignore resources.
Later, I stopped using it for sleep too, so at that point Suunto was only for workouts, and Recovery still gives data, but now it is pretty much only using TSS and “feelings” and simply doesn’t weigh sleep/HRV when it does not have it.