Saberus :
I think the edge connector is a brilliant idea, and wonder why there aren't more companies using it, it eliminates a point of failure where the solder joints were.
I guess because in some ways its so old school. (It saved money back then too.) Back in the "Home Computer" days card-edge connectors were used for expansion connections (on one side of the connection.) Retro consoles used it too with game carts. The PC used it then, and even still today, for expansion AND adding graphics. Back in the day Floppy drives, primarily 5.25" and larger used such a connection for data (and a molex for power.)
If that patent ever gets challenged, I dunno if it will hold-up because of all of that. In Modern storage though, the connector is, currently, unique though.