Are any of yuz giz artists? Its the art, the talent, the love that a custom builder puts into the bike.
For instance - Two frames, exact same tubes, lugs, and geometry. One is built by robots in Japan, China, Tiawan, whatever. Every bike on the assembly line looks and rides the same. The other is built by Guiseppe in a small shop in Milano. Guiseppe has good days and bad days. His bikes reflect that in the way they ride. His bikes have soul. Its in the blood, the geneology, the passion. Thats why English bikes are doudy, French bikes are persnickity, and Italian bikes are fast. If you want a touring car you get a BMW. If you want a race car you buy a Ferrari. If you are off the wall, a Citroen, a snob, a Jaguar.