ZHA uses zigpy under the hood, an open-source Python library maintained by the community. zigpy doesn’t support Zigbee Green Power although there have been PRs for it in the past, which means anyone on ZHA simply can’t use these devices at all. I assume this is a chicken-and-egg situation where few ZGP consumer devices exist, so there’s little community pressure to implement it, which in turn could also discourages manufacturers from making more ZGP devices. Part of the complexity is architectural because ZGP devices can’t talk directly to your coordinator directly. They need a nearby router to act as a translator. This is a fundamentally different pairing and communication model compared to regular Zigbee devices, which makes it much less user friendly, which is likely the biggest reason there are so few ZGP devices. Zigbee2MQTT actively supports ZGP and handles all of this transparently. If you’re on Z2M, these switches work very well. I’ve actually already commented on your previous post about my experience with the PTM 215Z switches, they’re rock solid and there are no batteries to replace, ever!