Fallen Into Knowledge

I’ll be the first to admit that I am not very familiar with the book of Ezekiel. So, my observations may be wacky.
I think it is interesting that the book of Ezekiel ends with I kind of “Pentateuch in miniature:” We get a description of the temple, a lay of the land (the tribal inheritance), and some laws. This miniature seems to happen, narratively, after the return from exile. It is this last observation that I find interesting, but I am not sure what to make of it. Why is the “post-exile Israel” described in much the same way it was in the Pentateuch? My expectations are that “God will write the law on their hearts” and so forth. Yet, this expectation doesn’t preclude a social order like unto the one laid out in the Pentateuch.
I’m not satisfied. I think I will have to return to Ezekiel when my forty days of lent are over. I am really baffled by this book.