It still begs the question: What about the—in my experience—more common use case where they are the same (i.e. current title and description is sufficient for social shares)?

Here is an example of a discord server refusing the expand the site description and title on one of my sites[1], just because there is no og:title and og:description (even though I provide both <title> and <meta name="description">).

All I can take from this is either: a) Social media companies are bad at (or don’t care about) implementing common sense features, or b) Facebook is actively and aggressively pushing their own proprietary format over established standards. In either case it is bad.

1: https://forums.online-go.com/t/random-starting-position-flex...