I disagree, it would make the install SIGNIFICANTLY CLEANER looking. I hate the look of my wires running all the way around my video card to plug in the front side of it. Looks terrible no matter how you do it.
Not only cleaner looking , safer as well for people who will use cheap cables or wrong/overloaded extensions.
Also the plugs wearing out in case you plug/unplug them alot , or using more force ..
More over , the clearance needed above the card in the case for the cables , you can make more compact cases , we already have huge cards from the large fans , and on top of that you will need 3-4 cm minimum extra clearance above the already tall cards.
And finally , less cables means you dont have to worry about the cables to reach the card any more being short compact case that needs special short cables , or long cables routing when the cards are in a huge case ..