HomeKit Night Shift
Lighting control has been at the core of home automation systems for years, so it’s not surprising that it was also the first category to be supported by HomeKit, which could not only turn lights on or off but adjust colours and colour temperatures. The catch is that this had to be done either manually or on a fixed schedule that you specifically set up.
It looks, however, like iOS 14 will be able to automatically adjust light colour temperatures throughout the day in a more gradual and natural way. For example, rather than suddenly changing the colour temperature at 7:00 p.m. or 30 minutes before sunset, HomeKit could slowly adjust the lighting and colours across a wider time period for a more natural experience. This could also be applied for things like wake-up and sleep lighting. While other vendors already support these features in their own apps, the main benefit to HomeKit adding native support is that it would work across the entire gamut of lighting devices in your HomeKit system, and not just one particular model.