The music controls Android 10 added in the notification, where you have a slider to select where to play from should be added to the lockscreen music controls and the "Media" section on the notification pull down.
It just feels like a wasted opportunity at the moment. Clicking into music controls on the lockscreen only shows album artwork and the standard play, previous and next track controls you already get on the lockscreen.
Media section on notifications just doesn't feel worthwhile
Also, please make the music controls more reachable top left on the lockscreen is horrible, should be placed lower