Was there a purpose for the use of West-Semitic in the Amarna letters from Syria-Palestine?

One of the perplexing elements of the Amarna Letters, this archive of political correspondence from Tell el-Amarna, is their linguistic diversity. The letters from the northern region (upper Mesopotamia, north Syria, Anatolia) share features of Hurro-Akkadian, while letters from southern Syria and Palestine are influenced by West-Semitic. The articles explores these West-Semitic features as well as the presence for West-Semites in Egypt and its foreign office in the Amarna period.