Неоконченные предания Нуменора и Средиземья

The collection feels like a treasure trove of lore, but I wonder how Tolkien selected these particular stories and fragments to share.

The title itself hints at something unfinished, and that tone really permeates the collection. How did that impact your reading experience?

The storytelling feels more like exploring a mythos than reading a traditional novel. I wonder what Tolkien's reasoning was behind this structure.