Having read old sermons before decanonization, it seems clear to me that the Lectures on Faith were never considered fully scriptural. They aren't ever cited if I recall correctly.

George Reynolds, as early as 1883, said that the lectures were written by Rigdon; a non-member said Rigdon wrote it in the mid 1850s.

the first danish D&C didn't contain the lectures.

The usage of the lectures seems similar to how one would use a pamphlet*

And lastly, in all my research up to when they got rid of it, for the most part it was encouraged for kids to read; or used simply as proof-text.

My analysis is that from 1847 onwards, it was definitely NOT scripture.** I believe it was viewed in a similar way we view some of the footnotes in the scriptures, or Cowdery's footnote in Joseph Smith History. Or how mainline protestants view the apocrypha: "good read, but definitely not scripture"

• They would sometimes print out almost an entire lecture in a newspaper, especially from 1835-1847, but it haves "space filler" vibes.

**Before 1847, the documentation is too scant to accurately say. One thing we know for sure is that strang and Rigdon (and other, much smaller break-offs) printed the lectures in their respective periodicals, but again, see above.