Why does Isaiah make it so confusing who is speaking? Isaiah chapters 8-12, 2 Nephi Chapters 18-22

Why does Isaiah make it so confusing who is speaking? Isaiah chapters 8-12, 2 Nephi Chapters 18-22

Here are some of the voices that Isaiah uses in his writing:
himself
Heavenly Father
Jesus Christ, the Lord
The unborn Lord about himself <--- which is definitely odd

I think there are almost certainly multiple reasons for why Isaiah doesn't have quotation marks, so please note that this answer is not intended to be all inclusive.

Jesus Christ appeared to the Nephites in America and he himself commanded them to "search these things diligently; for great are the words of Isaiah" (3 Nephi 23:1).

It's always so much nicer to search things when they are a little bit of a challenge.

I guess that is one reason why I love the temple endowment. It has a lot of layers to think about.

Similarly, by not being totally transparent with the layers, Isaiah draws in the reader to think about it more deeply and make judgments about it themselves.