Yes, but in that case the FEP process needs to be modified to reflect that, as currently it is not about related things, but a FEP might just say “I want to add this one property in this particular location/use case”.
AS Groups is an example. “Here is how groups should work, when we encounter them from the AS vocab”.
This is what I am also trying to say. Maybe should draw a diagram of it all 
An example for FEP-bar… someone submitting a “Video Transciptions” FEP and saying:
- I have this new vocab proposal for video transcription.
- But I want propose this type or property to
fep-vocabas it is more generally applicable. - And to those folks implementing
bar-vocabI suggest they standardize this property.
(Note: The diagram can be opened in diagrams.net and directly edited there)