I think that two of the worst sounding speakers I’ve ever heard were Heresy H700/H1 and 70’s vintage LaScala. I don’t like Roy much, but he’s made Klipsch speakers quite listenable. His Forte IV, Cornwall IV and Hersey IV speakers I’ve heard all sound excellent. Vintage Klipsch? Not so much, unless you like no bass, sibilant treble and shouty mids; the K400 is one of the most awful horns I’ve ever heard. The speakers do a thing or two well, but in overall stock configuration? They’re not that great, but their flaws are easily remedied.
If the vintage speakers were as good as you say, what are you doing for a side hustle?