Bridging topics a bit, but I think it applies.
As Kevin posted in that thread, its not quite a simple “yes and no”, but I feel this detection process relates to this idea of “Always On” devices and trying to identify “phantom” vs “detected”.
Sense may know about the air purifiers because it recognizes the on, but after a while, it may “lose the trail” to know if its still on. At some point, unless the device has lots of recognizable patterns while running, there is nothing for Sense to track. Sense certainly has more smarts than JUST the on signature to know if something is on, but for lack of a better description, I believe there is some “Educated guessing” going on with some devices.
You may not have experienced it it, but I know every once in a while in the summer, my AC will be off, but Sense still shows it as on. If I go look at the device power meter, you can see a little movement in it, and then it just flatlines for a while before ultimately it turns off. I have always assumed there is some sort of “cleanup” routine that runs to make sure things make sense. That is what I assume eventually turns off AC after a period of time that Sense isn’t sure that it is on.
The way I picture it - some devices are “Easy” for Sense to track. They have an easy to spot “on” signature, and have a visible enough running signature that Sense is able to keep an eye on it.
For others, there is the “estimated guessing”. So something like a fan / or steady motor. Clear start up signature. Over time, Sense learned “if I see start up signature X, it is always followed by a sustained 200w until I see Y signature.” So if I see X sig, and main power consumption increase = 200w, then say device FAN is ON. When power drops by 200w, say FAN us OFF.
I’m sure I’m way over simplifying the detection systems, but in that general direction , this is what makes tracking always on really hard at a device level, vs what it is now, which is a statistical number.
I know its not ideal for what you are looking for, but if you do want to get some breakdown of actual devices within your Always On, your best bet is adding some Sense compatible smart plugs to those devices. That way Sense knows the name of the device, and can attribute it into your Always on.