go over to frameforum it should answer all
broken down simply its a set of tubes welded together by one guy or another b
its very personal to some people and opinions vary …but for me its about fitting you perfectly .bike fitting is sometimes a bit nick pickety if you dont fit into the correct size slot
the second is that the guy building the frame will hopefully have some passion in handbuilding mitreing and welding (or more traditionally) brazing the frame then rounding the fillets to perfection..some builders are so good at fillet brazing only minor cosmetic touch up is needed …im sure your wondering how this impresses people but some geeky types do like to feel fillets.Its made by hand from tubes to boxing it up
i do think the chiwanese can do some pretty amazing production stuff …like welding
thirdly you no know one else will have a bike like yours unless it gets nicked and be prepared to wait for your handcrafted bike frame..some niche builders have 5 month waiting list if not longer
A while ago i toyed with the idea of doing custom carbon frames ..ie done properly but kind of kept getting sidetracked