Because the advantage of the artwork view (vs the artwork+track view) is that you can see a lot of albums/artists quickly and with a nice image based layout. But when there is only one album to select from, you gain nothing to have the cover alone, and it could be better to directly display the cover + tracks.
But yes maybe, it sound logical for me, but can annoys others. Maybe it can be disturbing.
I just see that there is an option to "switch to album and track layout when drilling-down and viewing the albums for a selected artist", but this option 1:doesn't work when you select the artist from the track browser 2:work when you effectively click on the artist from the artwork view but then the track browser disappear. And here, removing the track browser is really disturbing, no doubts this time
I think that the artwork view haven't been designed to work conjointly with the track browser ? But i like to have both, because the track browser is the fastest way to browse the library, and the artwork view is the nicest