Memories are very much subject to confirmation bias and sampling bias. Basing knowledge on personal experience is not solid epistemology. Further, the "I was alive and remember all of the media landscape at a time 50 years ago" is an appeal to authority fallacy. I don't personally dispute your recollections at all, and that is your impression and lived experience - but it does not make it facts. Extrapolating from an individuals experience is liable to be very faulty, again, poor epistemology.