@JoshRoss: With this reasoning you may tell Microsoft to not bother making Excel for WP, ExcelViewer for WP would have been good enough.
But wait, we might as well just export the file as PDF and view it on a Windows Phone. In that case I could have uninstalled Office for WP and save a few GB of storage. Just install PDF viewer for WP which is 4MB in size would be enough.
Is that what you want to tell us?