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@dancing james
As I understand it, there is the fit triangle of BB, saddle and hands, and if your fit is correct this should involve a flat back/neutral spine (as much as possible). This position can then be rotated about the BB. So for a TT bike the saddle comes forwards, the bars drop down and the spine may become near parallel with the ground. Whereas for a longer distance bike (audax etc) the position may be rotated in the other direction, as you are putting less power into the pedals your more of your body weight will end up in your arms/hands if you are in a very forwards aggressive aero position, additionally at lower speeds aero considerations become less of a factor.
I have a feeling some of these T-Rex fellows would be in a better/more normal position if they worked on core strength and flexibility. Though this is about as popular on lfgss as suggesting that road fixed bikes ought to have at least a front brake.