It would be great if the devices would have support for a “last activity” sensor. This could be super useful to figure out if devices have 0% battery (in case they fail to report, or something else happens). For example, if a door sensor is set to check in every 24 hours, but it didn’t do that twice (e.g. last activity > 48 hours), we could automate a warning.
In the zwave-js ui, I can see the last activity value so hopefully it can be exposed to home assistant.