I hope there's an exhibit on the first generation ten-speed dura ace group set, which was a legitimate jump ahead in capability and precision when it was introduced in 2004. Everything since then has been refining some of the same.
Before that you had to watch gears all the time.
I remember tinkering with my Ukrainian gears to make them more loose in "Shimano style".
https://uk-wikipedia-org.translate.goog/wiki/%D0%A5%D0%B0%D1...