Sadly when specifying jobs and explaining weather comp, a lot of property's are not suitable for it to be installed
What might these properties be?
Houses with differing levels of insulation (e.g an old house with a large modern extension) are one example.
I don't see why this type of building would not benefit from WC.
The greater the heat loss from the building the more important varying the output of the heat emitters to match the prevailing load as set by the outdoor sensor , thus reducing heat loss through the fabric of the building.
You would obviously set the curve for the "older" part of the building with trv's or a separate mixer valve trimming the output in the newer part.