Welcome to our community! We’re already loving the feedback!
If time allows you can introduce yourself here;
https://community.realtimelca.com/t/introduce-yourself/32
To add my five cents to your question; currently it is a limitation in the Revit API to get each material layer, why it is aggregated. Try to make a Material Schedule in Revit for that same Interior Wall.
That being said we are currently looking at different workarounds to get the level of detail you’re interested in.
