The most glaring omission from my Home Assistant environment is my Schlage smart lock. I originally purchased a Schlage Sense lock to work with Apple HomeKit. Later switched it to non-HomeKit mode, using the WiFi adapter. But the Sense hardware is pretty much closed source.
Other options are Schlage Connect (ZWave) or Schlage Encode (WiFi) but these both come with limitations. Connect/ZWave offers a minimum of interoperability. Encode/WiFi is similar. Neither of these two Schlage products offer a fully-featured interface to open-source home automation software.
I’ve reached out to Allegion before, to no benefit. Perhaps the HomeAssistant / NabuCasa teams could reach out?