Back in the day computers were typically flat. Then they came up with this great space saving idea (that didn't save any space) called a tower. All the expansion cards were (stupidly) dumped over on their side, and the video cards got bigger and bigger until they bent under their own weight while torqueing the slot.
Now comes this wonderful idea to mount the card vertically to solve a problem that wouldn't exist if not for towers.
I'm going to look for an old style flat case and put it up on my desk, under the monitor where it will be up off the floor, out of the way, convenient to turn on or load a disk and the cards will go the direction God and gravity intended.
Ask me how I really feel.