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Under the entry for |based_on=, I changed "Use this to list the literary work on which the libretto was based (if any)" to "Use this to state the literary work or other subject on which..." (emphasis added for clarity), to reflect actual usage.
I reiterate: template documentation should reflect actual usage, not attempt to proscribe a usage for which actual practice demonstrates consensus.
... because Nikkimaria busies herself with removing it. I support Andy Mabbett's phrasing because an infobox should contain the salient details of a work. If a work is based on the life of a pharaoh, it is helpful to mention that in the infobox. I know that this is almost always mentioned in the article's 1st paragraph, but so is everything else in the infobox, and that doesn't invalidate the concept of info boxes. -- Michael Bednarek (talk) 12:58, 12 May 2021 (UTC)[reply]
I support the rules to follow frequent usage, as Andy did. The basis for operas is often literary, but also often not, and should still be given. - Even the minority means many cased, many cases in which the information may be useful to readers. (Actually, whatever the documentation says, I don't understand the removal of information that may be helpful to readers.) --Gerda Arendt (talk) 12:49, 12 May 2021 (UTC)[reply]
I would not agree that it is "many cases"; it doesn't seem to be common, and the change poorly defines what "it" should be Not to mention that the proposal makes little sense in the context of the rest of the documentation for this parameter. Nikkimaria (talk) 00:19, 13 May 2021 (UTC)[reply]
There are currently not many cases because Nikkimaria removed them. Anticipating the rejoinder, "but that was done to comply with the documentation as stated": the current discussion here is exactly about that unnecessarily narrow wording which makes no sense and is against the purpose of an infobox, to "summarizes key features of the page's subject." -- Michael Bednarek (talk) 06:50, 13 May 2021 (UTC)[reply]