I mean, where would you rather play? In a provably fair game? Or in a probably fair game? (investors and house not included.)
I'm not trying to be a dick here, but I'd rather use the status-quo. If you're going to add so much complexity, you're going to need to add some advantages, which I can't see what they are?
The shuffle is still going to be very difficult to dictate as it would require several "tries" to get the preferred cards
Who cares? Computers are fast. A million shuffles in a second doesn't seem impossible to me. But anyway, if you can have many tries, even picking the best of 2 or 3 gives you a mind-boggling advantage.
This can be minimized or negated by the dealer first accepting only the hash of the client seed, until all players have committed, then accepting all the client seeds, then shuffling quickly, then dealing.
This just gets worse. What happens if the player disconnects between sending the hash of the seed, and the seed to the server?
). Besides that, you can easily see the socket.io socket.