Hallo, I wanted to suggest, that it would be great if Lyx would store not only the lyx file and the graphics in an exported lyx archive (tar.gz or zip), but also the created latex file.
In my understanding, one of the major functions of the archive is to give away the document to another user or to a journal in a single file. If this other user does not prefer lyx, he / she can optionally use also the latex source after unzip. Also, if the exported archive is used as backup, the exported latex file would be useful in case of any long-time compatibility issues. Regards, mf