[Somehow this may have gotten in the wrong category. I don’t know how to move it.]
In my office I use multiple screens on both my desktop and laptop machines. For Adobe Premiere Pro projects I use two external screens for Premiere windows and the MacBook Pro screen for script and notes. A similar approach is used for Tax Preparation and Estate Management. Universal Control makes easy access to other apps on my Mini as necessary. A similar approach is used for Tax Preparation and Estate Management.
iPad use is generally for reading equipment manuals in the field and other single task usage.
Bottom line: I don’t use Stage Manager because I have not yet seen any advantage to Stage Manager which would justify pausing my activities to learn how to use it.