Say you have the following situation:
Project B can't compile because the assemblies used in Project A are unknown in Project B.
This means you currently have to merge the assemblies.xml and directory in a place accessible to Project B, and specify that merged assemblies.xml in Project B's AVM -assemblies startup parameter.
This is very cumbersome, as both projects live in their own private source code repositories, and Project B should not need to know when Project A's assemblies change.
It should somehow be possible to inherit the assemblies.xml settings from a referenced project.