Most old FOSS is written and maintained in programming languages that Kids these days™ don't think are cool (and were probably never taught about in school either).
Hardware used to come with an extensive manual. Hardware these days is a vendor-locked black-box with built-in obsolescence that might get you in court if you open it.
Kids were more curious and spent more time outside, Kids these days™ spend most of their time under the light of screens, inside their safe spaces and can't even tie their shoelaces.