It is useful to open work shared models detached from its central file. This allow for some quiet on-the-side sheet printing, exporting of cad files etc. without bothering about continued work being reported back constantly.
This is still relevant in cloud work shared projects, too. In these you currently (well ok, R2024) need to open the model you need and then use the save-as dialogue to save it somewhere local. A new file saved in this fashion will still be a work shared file and the user keeps wondering whether it was truly detached. To make sure, you close the model and re-open it using the standard file-open procedure and tagging that 'detach from central' switch.
I realize this is somewhat similar to the stop work-sharing idea (which did not take off sadly) but tackles the problem earlier on, ie. b4 opening the file.