Interesting thread, speaking as someone who owns a SC Nomad Carbon but has just built up a Ragley Blue Pig (with 150mm travel forks)as a '2nd' bike. I am bowled over with how capable the hardtail is and, actually on the downs, feels very similar to the Nomad. I also ride Gisburn and on my first outing on the hardtail set PB's on the Hope line and Hully Gully line compared to times I had set on the Nomad!
However there were times on Hully Gully where if I hadn't been clipped in I would have been off over the 'chattery' bumps. Also fatigue is a factor (as someone else mentions), you can't have a crafty sit down to stick a few pedal strokes in half way down a run on a hardtail otherwise bruised buttocks will be the outcome!
I love both bikes and in an ideal world - have one of each! However if this isn't possible, can I justify the price difference of the frame for the Ragley over the Nomad (approx. £250 verses £2500!)? - no not at all!