Separating the queue will make it easier for users to add content they want to listen to at a not-so-distant later time.
For example, users might look for podcasts while they are listening to music or listening to a podcast while browsing music.
If they find an episode that they find interesting, and want to listen to it later, they have to download it and then look for it in their Unplayed section, which can be difficult if the user has a lot of unplayed shows.
Separating the queues will make it easier for users to quickly switch between music and podcasts/videos
-Users can create a quick list of content that they want to listen to without having to create a new playlist.
-Listeners will be able to sync up podcasts on a queue without interrupting their music listening, and vice-versa.