Here it says that all archaeologists had to leave Iraq in 2003 - due to security concerns;
Also with Mesopotamia/Akkad they had the real problem of establishing a timeline of events; records for each city had to be correlated, much more complicated than Egypt, where they had centralized rule for most of the time.
Also the library of Ashurbanipal got messed up (wikipedia says "Due to the sloppy handling of the original material much of the library is irreparably jumbled, making it impossible for scholars to discern and reconstruct many of the original texts"), so we really do not know too much either.
Also the clay tables got partially baked when an ancient library was sacked; so that would help to preserve the clay tables, but i guess this processing would also damage them,
See "A History of Sumer and Akkad" by L. W King
i guess the question also got deleted, at least i can write this as a kind of taking notes ;-) these are the customs of this reddit.