I've been rolling my own stuff, mostly devices posting to custom python servers, storing data into influxdb and mongodb, triggering other servers on events, and lately also integrating Tasmota devices via MQTT, like the microwave, washing machine, computer monitors, small heating fans and the like. I migrated all Hue devices to zigbee2mqtt and am happy with the flexibility.

Initially (7 years ago?) I refused to use HA because I've all too often had the issue that then projects become stale and I need to migrate to something else.

But lately I've gotten the feeling that HA is really here to stay, with a community big enough for this project not to die and maintaining very good hardware support.

What I'm missing out on is an (Android) app, and I think that this would be a good reason to think about moving over to HA.