@dusx said:
This workflow is hugely optimized and allows you to bring in audio from any source along with the stage image recording.. this allows you to even mix in multiple audio sources if you like (narration being one use case).
Though, for OBS on macOS, you have to go to the trouble of making an "Aggregate Device" to capture the system audio. See this link for instructions on how to do that.
Best Wishes,
Mark