Sooo

It's worth mentioning that UCI have a regulation about the minimum saddle setback, rule 1.3.013. Tip of the saddle shall sit 5 cm or more behind the bracket unless there is a morphological exemption. I think this is the point that everything started from. It is not a secret that if you decrease setback you use more the quads at the stroke and if you increase it you use more hamstrings-gluteus. This is the reason why triathlon bikes are set up different from TT bikes. In triathlon they want to protect quads for running so the use more setback generally. In a bike world that everything started from road bike geometry it makes sense that seat angles were around 73°. They use this form the point of efficient power transfer and equal muscle fatigue probable. Of course if you don't road,cx,xc or marathon race no one can force you to adapt that. EWS is not UCI and enduro/trailbikes should adapt their geometry to give the best. It was about time to make this step as it seems.