All forementioned points are well taken... However;

Food for thought, an alien but related product (sailplanes; i.e. those aircraft used in soaring) share a common bond with the bicycle. Great need for material with the maximum strength to weight ratio that has excellent resistance to failure. The progression of materials of choice for sailplanes has been initially wood/fabric; then Aluminum; and now fiberglass composites dominate.

Sometimes it is a good thing to step back and view issues from afar, least the forest becomes obscure for all the trees. Think carefully about this, Darwinian Section while only theory is now widely accepted as a valid outcome of competition for species (materials?) survival.

Cheers;