The circle / grid with icons on the home view shows a color coded status of the rooms of the home: red when a door is open, yellow when a window is open, orange when the heating is on, cyan when lights are on and green when nothing is on.
Customisable complications on the Watch can have actions to go directly to a room view and execute any scene.
Tap / Clicking a widget item to go directly to a room view, execute a scene or launch any url-scheme.
Below is a detail view that can show a camera view, a website, a temperature, humidity and climate history graphs.
I made an app for my Apple Watch to see a glanceable status of our home and to control our HomeKit devices.