an important missing feature seems to be critical alerts (high-priority notifications that bypass DND, silent modes etc.). Several use cases would benefit from such a functionality (alarms, contact-sensors, in-house trackers for pets etc.).
I’ve seen several requests regarding Android (something about notification categories). However, none for Apple (sorry if I missed it), which supports critical alerts out of the box (Home already does it, my HikVision doorbell uses it for calls etc.).
There is a (kind of) workaround, using HomeKit, but it doesn’t offer much control (e.g. if a window opens during the night etc.).
This is how it looks like:
