I'm sorry that's just dumb. No one magically forgot all the R&D from the past. They know all the intricacies more than ever. Concerts, theaters, and stadiums are alive and well. It's fair to say that a lot of them don't sound good though. And there's a lot of arguments that lower accuracy of the past is more appealing to the ear.
AG isn't a good example either, as a company who uses drivers that have different intentions than the likes of pro drivers, but in horns. You're mixing pro and audiophile like they're a direct relationship... They aren't. No one owned big Western Electric speakers in their homes, that isn't who bought them originally.