This is the most important part of your post. And I too do use some Xiaomi devices directly on HE, but after dealing with dropping so many times, I always hold a strong YMMV stance with them.
I’ve been syncing Xiaomi sensors back to my hubs via HomeKit for two years with perfect results. They absolutely do not drop from their own gateway. But HomeKit has it’s own limits for this, beyond just the fact you need to be an iOS user to sync with an official HomeKit hub.
There’s a new community project in its early stages, but it’s showing very promising results. It is very easy to setup, and doesn’t require anything more than a spare computer, or RPi and a $20 Mijia Multitimode Gateway with HomeKit compatibility.
You don’t need to be an iOS or Mac user, and you won’t need to configure anything after the initial setup. You just add sensors to the Xiaomi bridge and they’ll show up in HE upon first active state.
