Thanks but the need for the hardware key is documented in both the Hardware integration and the default_config integration.
In contrast, the schedule key is not documented in the default_config integration. That omission may trip up users who don’t use default_config and prefer to cherry-pick its integrations individually.
For those users it’s common practice to review default_config's documentation whenever there’s a monthly release to see if any new integrations were added (in August it was bluetooth). However, for September’s release, schedule isn’t mentioned in default_config's documentation but it’s definitely part of the default_config integration.