Because there is a problem with the S4's never getting up to anywhere near their 2TH capability on a pool unless that pool lets them set the minimum difficulty to 2048. I don't pretend to understand it... something about an underpowered controller board and a death spiral dance it does with vardiff. But the the upshot is I can't point my S4 at slush's pool unless they bring back some way of specifying my per-worker minimum difficulty setting :-(
And I just had a very sad few days at BTC Guild... now i have to try GHash -- I would just like to keep ALL my terahashes here at the Slushiest Pool of Them All :-)
I'm still wanting to get the S4's very soon. I would rather keep them here on Slush myself. However, if I have to point them at another pool and keep my S3's here, I will do it. It's a shame if that's the case... really is!
Seems like I heard rumors of a NEW LOOK to the home page, statistics page, etc. coming in January. Makes me wonder if Slush will enable the ability to adjust the diff if the user chooses too when the NEW LOOK comes in January?