Your post is (now) in the right category where you can also share feedback etc.
As for “Why Plex Labs”?
Plex Labs is the place to learn more about the awesome tech behind Plex, discover some amazing contributions and third-party apps from our community, and even test drive some of our very own passion projects and experimental features.
From https://www.plex.tv/plex-labs/
I suppose that translates into those apps are still considered experimental and/or passion projects. Not sure if/when their features will be integrated into the main apps.
Personally I’m rather happy with the snappy Plexamp as my to-go music player and not having it mixed up in all my other content – but that’s just my 2ct 
