Are you saying that this was beyond the ability of man to think of something like that beforehand? Considering that the Torah was the center of their cultic worship, along with the Temple, I would hardly think it unlikely that someone would imitate the style of their most treasured work.
It is not only interesting, it is profitable since it is found in scripture and all scripture is profitable.
Yes, it is - but for what purpose?
...profitable for doctrine, for reproof, for correction, for instruction in righteousness, that the man of God may be perfect, thoroughly furnished unto all good works. 2 Tim 3:16,17
God is constantly moving us to dig deeper into His word, as you have rightly said. But I think we can fall into the trap of overspeculation - which was part of Luther's reaction to corrupt Scholasticism. Not sure about the Psalms 119 comment, since the numbering of the Psalms are not inspired by God. Nor are the names of the individual books, such as "Matthew". When first written, they didn't have author's names on top of the book or letter, that was added later.
Regards