Generally, SALTs and schools know more about communication than paediatricians.For that reason, interesting that paed. chasing this up.Most seem to think SALTs help people to speak nicely.
All ocmmunication is by definition, social, but obviously some can be purely functional as TC describes.
In early communication, useful to think of language being used broadly for requesting (functional) and commenting (social).
Thus a single word utternace such as 'Aeroplane!' can mean 'I want that plane on the shelf, there' or 'Wow,Mum, look, an aeroplane! It's so intersting that i want to share this revelation with you.'
Madsad,please don't take me literally.I just mention Prgmatics Profile as a nexample of an assessment that looks beyond the functional stuff.What your salt uses is up to her.
Just find it really weird that you are being told social ocmmunication isn't being investigated.Are you sure you have the whole story?