They weren't cribbing from the 1979 BCP, they were cribbing from the 1970 English translation of the Roman Missal. They're bits and pieces of the Catholic Mass that were required to be added to get Rome's approval for the Anglican Use.
Hopefully when we get a new translation of the missal, some of the clunkiness will be removed.
I've seen those parts. Yes, they could use a little tweaking to get the language right, but it was pretty clear what was being done. The Peace now... was that also required?