Just imagine if of those huge cases were the standard in Japan. If you had a complete collection you'd need an entire room just for Saturn games.
My God I hate those cases. They shatter instantly, they hog, what, 3.5 or 4 x the space, something like that? Sure they have "bigger" manuals, but considering the horrible artwork and cheap-ass black and white manuals US games usually had, I'm not sure how this is any kind of advantage.
The only question is which system had a shittier US presence, the Saturn or the PC Engine? I'm actually not sure.
Both systems are known for shooters and fighters in Japan, but in the US at least 3/4 of the shooters and fighters never came out. This was also true of the RPGs. Both systems had ugly-ass black (because black is "mature") cases for the US. Both had enlarged controllers (although its almost impossible to tell the Turbo Duo pad is bigger, it is). There have to be other parallels...
And now, despite how great these systems are, they are basically viewed as huge failures in America, and are collected primarily by the sorts of people who also hoard loser systems like 3DO, CDi, and Jaguar.
Maybe I should do an evil alternative to my website, The White Line. It could be called The Black Line and cover all the bad things these three systems (PCE, SS, DC) share. Hmm...