The FAANG companies have an internal kind of elitisim that would make staff less effective.
If you look at any Google Java library, GWT, GSon, Guava, Gradle, Protobuf, etc.. there was a commonly used open source library that existed years before that covered 90% of the functionality.
The Google staff just don't think to look outside Google (after if Google hasn't solved it no chance outsiders have) and so wrote something entirely from scratch.
Then normally within 6 months the open source library has added the killer new feature. The Google library only persists because people hold FAANG as great "Its by Google so it must be good!" Yet it normally has serious issues/limitations.
The Google libraries that actually suceeded weren't owned by Google (E.g. Yahoo wrote Hadoop, Kubernetes got spun away from Google control, etc..).
Plex has been baking in features like that to help you see what is on other streaming channels, etc..
Personally the whole point of Plex for me was it was a container for my existing DVD/Blu Ray collection, while Plex has added some really cool features. Increasingly they keep resetting the dashboard to try and force engagement with new features, it feels a bit user hostile and I've been switching to Jellyfin (same idea but entirely open source and self hosted).
From a discovery perspective, personally I've found good content tends to create its own word of mouth style buzz.
For example at the moment you can't go near twitter, reddit, work, BBC News, etc.. without someone talking about 'Mr Bates vs The Post Office'. Recently the risa community kept mentioning Babylon 5 so I picked up all 5 seasons for £20 and watched it through. Similarly the Risa community really seems to love Star Trek prodigy so I'll probably give that a go at some point.