Why did Nintendo NEVER do end labels for their carts in Japan? The NES and Super NES had 'em. Heck, even *some* third-party companies had end labels for their Famicom carts. Did Nintendo think that nobody would ever buy enough carts that it would become an issue? Was it a simple cost issue? Or was it a conscious decision to spite the buyers of second hand games? ;)
I love how a huge collection of Famicom carts looks. Far more appealing, to me, than a wall of mostly uniform gray NES carts. But at least with NES, they're easy to sort through on your shelf.
Some fami games have end labels - I like that they don't necessarily have them, they have nice juicy colourful front labels!
I agree though that it can be tricky to organise them. Of course not an issue if you collect CIB, but I like to have a played and accessible cart collection to sift through.