Can anyone explain Pages Save, Revert/Delete or Cancel options?

They seem to pop up for reasons I cannot discern, and leaves me not knowing what to do, finding it easier to FORCE QUIT.

Just opening a document should not result in any such dialog, but trying to quit the application results in this question. I always save before closing, if any changes have been made, intentionally for cause. If I accidentally or intentionally alter the document, but do not intend to save changes, I certainly have no interest in deleting it, nor should I have any need to Revert a freshly saved document, and Cancel is not an option. Ergo: Force Quit. I've yet to see what causes the dialog to offer Revert instead of Delete, and at times, and not certain that why it is offering Delete, is as evidenced at other times.

It vexes me: I'm DONE using Pages, my files are saved, but it want's me to make seemingly nonsensical choices. By asking me to Save, it implies one of the files I may have open, may have unintended changes, so I dare not select Save, overwriting a correct file with an error. Delete is hardly ever desired, and would normally be handled at icon level, more reliably, since I seldom have a clue as to why Pages is offering the option. And Revert simply leaves me where I'm at, with an open application in need of closing, as is also true of Cancel.

What am I missing?