A use case for numbers in the menu: my wife starts an album and the music stops after one track. “This thing is f…ing broken again!” But we have only one track from this album. Had she seen there is only one item to play she would not have had to swear.
And what relation to this issue? 
You can enable counts in lists in the settings, but knowing displaying the number of songs in the menu instead of one more click would not tell you there’s only 1 song in that album.