Actually people DID know all the things mentioned in the OP. Not everybody, but somebody. Like the roadies for the big stars. Or Brian May and Bill Wyman building their own instruments and using them through their entire careers. Or people bringing instruments into shops for setups.
Just an example: "We had two cords. We used them interchangeably between speaker and instrument." You would notice pretty quickly that you were using a speaker cable to plug your bass into your amp, so I hope you at least owned two shielded cords.
BTW the only reason we know (and argue about) so much stuff today is there is more information available than there was back then. Not just teh interwebz but all the publications that didn't exist. Guitar Player magazine started up in 1967 and was all there was for almost 20 years. Mel Bay and Carol Kaye were pretty much all there was for method books and tablature began and ended with fingering diagrams showing scales and arpeggios, not entire songs.
I could argue that all the points made in the OP are still common with beginners. Nobody comes to the instrument knowing everything.
Just an example: "We had two cords. We used them interchangeably between speaker and instrument." You would notice pretty quickly that you were using a speaker cable to plug your bass into your amp, so I hope you at least owned two shielded cords.
BTW the only reason we know (and argue about) so much stuff today is there is more information available than there was back then. Not just teh interwebz but all the publications that didn't exist. Guitar Player magazine started up in 1967 and was all there was for almost 20 years. Mel Bay and Carol Kaye were pretty much all there was for method books and tablature began and ended with fingering diagrams showing scales and arpeggios, not entire songs.
I could argue that all the points made in the OP are still common with beginners. Nobody comes to the instrument knowing everything.

