Psalms 9 and 10 use the letters of the alphabet in order and as the sequence continues in 10 from 9 is a strong indication that we should read them together.
Aesthetic effects are important to how texts read, contributing to the overall impact of a passage.
Akkadian is a Semitic language , and became dominant because Sargon king of Akkad was the first Semite to gain ascendancy in the region. Akkadian speakers soon split with two major centers, Babylon in the south and Assyria in the north. Later Assyria became dominant and the Assyrian empire rivaled Egypt for control of the region during the monarchic period in Israel. During the final period of Assyrian ascendancy Aramaic became the dominant language as it was the mother tongue of many administrators. It ensured however that the Akkadian language was dominant.