It seems a major thing missing (either feature or documentation) from Input Controls is the ability to set the default value of an input based on the current value of a relevant device.
For instance with the examples using the slider to set a brightness level or the toggle inputs to change the state of a device.
Unfortunately if someone was to revisit a page with the current controls the state of these controls do not reflect the current state of the device, but a static default value.
This could lead to problems (turning off something that is on ) because the state for the toggle doesn’t reflect the current state. Then if the button trigger is fired the static default state is sent rather than the current state turning off a device.
The same would happen with the brightness slider (brightness has been set, someone revisits the page) the slider is at 50 (even though previously the value is set to 20). Some other value is being changed and the person forgets to reset the slider to the current value and inadvertently resets brightness to the default.
I hope I just missed something in the documentation