Process isolation within the same Function App
It would be beneficial to be able to run multiple functions from different Function App Projects in the same Azure Function App. Why? For simplicity purposes. It would be unmanageable to create so many Azure Functional Apps for each function when they don't really belong in the same project. Versioning of external references is one reason to have isolation.
Since you are already hosted in Azure App Service, you could leverage Virtual Directories as a mechanism for Isolation.
Updating status to reflect previous message. We do not plan to do this.