The old bikes, those built before, say, 1995 or so, were rolling art. Especially some of the more flamboyant makes like Colnago, but even my Takara has hand-cut lugs at the frame intersections and lots of cut-outs in different parts (ALB would love them) that make the bike interesting and artwork. Even my old aluminum handlebars have engravings on them, the lower fork and rear drop-outs are both chromed and the rear has adjustable axle snubs to adjust for the derailleur and to keep the wheel straight. You don't see that stuff anymore. Now, frame members are welded (or glued, if they're carbon fiber) directly into each other with out lugs and specific derailleur or brake components are specified or they might not fit. I also have a chart of precise torque settings for anything on the bike to keep from over-stressing the carbon fiber parts.