tFUnK

I see your point and agree that each material (including carbon) tend to conform to certain tube profiles. I guess I would argue that there's more room for creativity (and what the market find acceptable) for the metal bikes. What comes to mind are the custom/weird bespoke steel frames out there to keep things interesting, or the helix tube titanium frame, or even how different a Caad looks from an Allez Sprint. I get there are carbon aero bikes vs. lightweight climbers but to me the fat tubes kind of look similar, especially now that there's a trend towards carbon bikes designed to be both light and aero - Tarmac SL7 comes to mind.