Hi, the Tasmota firmware is MQTT-oriented and their author said they would not accept a contribution to support other communication protocols like WoT. The Domoticz, OpenHAB and other integrations are all MQTT-based.
The Things Gateway would support Tasmota devices by having a MQTT adapter. I believe such an adapter could be very nice for hobbyists since MQTT is often used by them. We could maybe try to continue the work started in https://github.com/hobinjk/mqtt-adapter.
And because I did not see this thread before (sic!), I also open-sourced a firmware for Sonoff Basic devices: https://github.com/willdurand/sonoff-webthing, including SmartConfig, OTA, etc.