The confusion is complicated from traditional culture in the road racing industry. The last to use progressive materials and technology. The last to clip in, use index shifting, threadless headsets, tubeless, shunning materials like aluminum, carbon etc. The UCI " created a rule to suffocate this knowledge to protect past records set on out dated geometry. Most of the industry is spoon fed from engineers and designers who have little experience in a limited area of cycling and are forced to design inside the UCIs limitations.