The Affinity Suite is great, but I’m suspicious of its acquisition by Canva—I’m afraid their solution to “bringing the suite to Linux” will be turning it into a web service.
I think the reason you’re not seeing that kind of device is that zigbee is designed more for low-bandwidth, sporadic updates rather than continuous streams of live data like you typically expect from a probe thermometer.
The current version of Affinity is great and will continue to work forever—there’s no need to switch to an alternative if you’re already using it. I just don’t have much hope for its future development.