I appreciate both vintage bikes and modern bikes and I don't have 'lines' exactly, but there are things I'm not personally interested in using:

• Too much technology on the handlebars - a bike computer should have just a few buttons and simple data fields during the ride. I ride bikes to get away from watching screens.
• Tight leather, leather bondage straps and metal cages - specifically saddles and pedal clips. They're sexy to look at, but painful to use and not in a good way.
• Tubular tires - I roll my eyes when anyone complains about the minor annoyances of tubeless, because these are nothing compared to the sticky horror from the dark ages of tire technology.
• E-bikes where the motor is more powerful than the rider - I don't care how carefully tuned the assist is to feel like pedaling, if the machine is clearly more powerful than me then I'm operating a machine, not riding a bicycle anymore.
• Brakes that use corrosive fluid that breaks down plastic, paint, and skin - I am on team mineral oil.