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You’re clearly not a child of the 80s. It’s literally in the picture. The stack of paper.
Back then, monitors where shite and small. Diskdrives where slow. So debugging was mostly done on paper (print it, read it, mark the lines with errors) because you could read it better and it was easier to go back a page or two on paper because of shitty slow Diskdrives. It was the time when 640 kb was an insane amount of memory.
I disabled ipv6 long ago and never moved. Not even blinked.