What really sets TOMMY apart is that it doesn't require line of sight and works through walls. This opens a lot of possibilities.

You can create zones spanning multiple rooms without sensors in each room. Instead of traditional room-by-room motion detection, you could divide your house into zones like "upstairs", "downstairs", or "living area". Especially useful for controlling heating by floor or area-level lighting.

Working through walls also means less clutter. You can hide devices in drawers, closets, or anywhere out of sight.

There's also a pricing aspect: ESP32s can be acquired for a couple of dollars each, so you could have motion sensing throughout your whole house for a fraction of the price of dedicated sensors in every room.