Maybe in the 70's Fender threads and comments inspiring this, but I feel it's worthy to ask.
Does it just take 20-30 years of aging of woods, wires and pots to bring an average instrument into it's prime? Or is it just simply more desirable and we are all seeing a mirage of tone-heaven?
Option #3: Things were just made better back then.
It's all marketing BS. Some older instruments were great. A lot of them were bad.