I was very happy that my recently acquired, 100 dollar '87 Circuit came with 42 mm (ctc) Giro d'Italia bars and a proper 120mm stem. When I started riding again 20 years ago, it was on a '81 Medici that came with TTT 42mm bars and a 120mm stem and that is my go to set up. I really enjoyed my PX-10 and its 48 mm bars and 120mm stem but I was a klutz for the first few minutes of transitioning to or from it and my other rides. Now it has Nitto b115 in 42mm and a modified ITM 120 stem and the transitions are now seamless. If someone wants to experiment, they could set me up with ALL 38 mm bars and I bet I would be just as happy riding. I don't buy the shoulder width breathing comfort thing. IMO, there is no natural cycling position. (And I like the drops and the tops and the ramps and the hoods. My Criteriums are on my son's bike so he doesn't bruise his forearms.)