A shared document can be read or edited by people with different tasks. Choosing the same level of access for everyone can make it difficult to control work. Collaboration should start with the function that each must perform and the nature of the information contained.
I propose to verify who should consult, comment or update the document. Actual functions depend on the instrument used. A public link should not be adopted for convenience when content requires delimited access; the configuration must follow the authorized path.
Imagine a prospectus that is updated by one office and consulted by others. Allowing indiscriminate changes can introduce variations that are difficult to reconstruct. Consistent access to roles makes accountability on content more readable and facilitates verification of corrections.
Permissions should be reviewed when the document changes function or recipients. The technical availability of a mode does not prove that it is appropriate. Well-designed sharing makes work accessible to relevant people and retains understandable control over changes made.