I also tried VT, but i concluded (as you) that it’s too complicated for my needs - too many functions i don’t need and/or understand, since in my case TRV is only either fully open of fully closed, so i only need open, close and external temperature sensor function. So i ended up with HA’s built-in thermostat (as Freemi suggested) and simple automation.
I guess that VT is built for more complex things than simple on/off valve…
btw… there’s a blueprint for this valve to include external temperature sensor HERE.