Excellent analysis, JP.
Clearly, many specific "leading edge" designs from earlier times stand up well under contemporary scrutiny, as they incorporated significant advances in technology.
I found it interesting in the Wikipedia article that the term "Hi-Fi" has become so diluted over time as to mean, generically, and disparagingly, early mid-fi consumer gear, now the universal fare of thrift stores and flea markets, without regard to absolute fidelity standards.
"Hi-Fi" has thus come to mean, as a class, that nostalgic stuff which USED to be high fidelity, but now, no longer is.
What comes to mind is an Aristocrat with 12TRXB in it, as example. Do we like it? Well, certainly. Is it high fidelity anymore? No, alas, but it IS most worthily, "Vintage...."