It can make sense if you're building a GUI app for Mac that's “scriptable and recordable”. I think you'd use VBA for that on Windows. The GUI communicates wit

It can make sense if you're building a GUI app for Mac that's “scriptable and recordable”. I think you'd use VBA for that on Windows. The GUI communicates with the operational core via a message channel (analogous to HTTP requests and their responses) that can be recorded into a “script”. With those scripts you can automate tasks that would otherwise involve manually using the GUI. The “frontend” and “backend” wouldn't call each other's functions directly but use that interposed message channel instead. In that respect it's architecturally similar to a web app, but with all the code in one executable.