Is there a way to get the Google Home to shuffle play the whole library using a voice command? I have tried everything but can only get it to shuffle play playlists using voice command (by saying shuffle when playing the playlist). Thanks.
At the moment this is not possible, no.
That explains it. It's an easy workaround to add all your songs to a playlist and then ask to play that and then shuffle it.
I moved it to the feature requests. It can be done (although I am still working on improving the entire Google Assistant functionality), and if enough others want it too, I will probably implement it.