Those 'annoying spaces' ensure that the program is displayed in the correct ratio.
You can double-tap on any video and it will play it in it's correct ratio (wether 4:3, 1.85:1 or 2.35:1) or flick between full-screen.
Watching a 4:3 show in fullscreen mode however will make you lose bits at the top and the bottom... kinda like zooming in.
However, if you prefer it that way, different strokes for different folks... 😀