"It's not a great implementation since it uses a new pair of seeds for every spin and puts too much burden on the player..."

Provably fair systems are open source, which puts players and their computers at great risk - especially today. If it's not the best implementation, or even a great implementation, then why are we arguing this? The process is disturbing. It pulls data from a player's browser and computer each and every spin. In also puts the burden on the player.