1984 Colnago: https://www.steel-vintage.com/colnago-nuovo-mexico-road-bike-1984-detail?
2018 Canyon Aero Road: https://www.canyon.com/en-gb/road/aeroad/

There 's no difference. No difference between a $150 craigslist roadie and a $6,000 Canyon slave labor plastic bike. A steel roadie is geometrically identical and will actually plane so you can enjoy your ride and not have to worry about your frok snapping in half because of a stray pebble impact fracturing the woven + laminated plastic