…. but to export discrete audio-tracks from within PP nearly impossible.
other disadvantage: audio time-remapping. if you need to need to do a conforming 25>23.98 or others, audio ALLWAYS needs to be rendered prior playback. with FCP X do the conforming -> audio will play straight away, no render needed.
another one: XML-export from text-elements NOT possible
if you working with old-school DVD or Bluray (I am such an editor) and you need to export subtitles it´s impossible. premiere is not writing the text that will be created within the title-tool into the XML-file so you can´t use it for other workflows of generating subtitles out of the XML.
-> could easily be done with FCP X.