I still have trouble understanding how to add an MQTT device without YAML. It seems there’s an elaborate GUI flow made to deal with this, so why is this so complicated?

I have MQTT messages coming in. Their topics are e.g.

wx/temperature wx/humidity wx/light_lux wx/rain_mm wx/wind_dir_deg

How do I tell Home Assistant to just add the bloody device, and let me configure units afterwards and not type out 600 lines of YAML manually?