It’s been noted above already, but I’ll emphasize it a bit more. The Device Inventory aspect of v27 was never built to result in immediate device detection for the listed devices. Trust me, we wish it were so simple. Filling out the Device Inventory gives us data to utilize in the longer term, where we’ll eventually be able to curtail detection efforts in your home to roughly that pool of devices. We’re not there yet, but this is a crucial first step.
I’ll also add that this is a new feature and it will absolutely expand in time. But it’s a start and gets us pulling in useful data right away.