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24mm works just fine if you have a way to account for BB shells that aren't quite up to spec - like the HT2 does with its pre-load cap and double pinch bolt arrangement. Shimano arrived at that arrangement, and understandably Truvative / SRAM were reluctant to copy it wholesale like FSA does now. The stepped GXP axle is their implementation of a 24mm system that can work with shells that aren't up to spec. And yeah it's kinda simpler than HT2 in terms of the tools required and faff to get it going.
I like it - it seems kinda bomb-proof and the BBs last quite well in my experience, even when used for muddy MTB riding and CX.
Howard
Mostly taking the piss, but I really don't get the point of GXP. 24mm both sides works just fine.
Hope make an adapter so you can fit your silly GXP cranks into their nice shiny 24mm BBs.