I agree with what you're saying generally across the board.
I have little doubt that a Planar 3 is considerably superior to my Rega 3 from the mid 80s. Nor that there are some fabulous designs around the $1k mark these days.
I guess it's hardly surprising when you consider the amount of competition that is out there today plus the fact that sound quality seems to be far more of a priority these days as compared to convenience. The advances in design technology and engineering, of course, aren't going to hurt either, are they?
However, what happens if we were to compare a Technics SP10 from 1971 with its modern day equivalent?
Or, going back even further, a carefully restored AR turntable with a similar design from today?
I can't help but wish, for the sake of perspective if nothing else, that there were far more 'real world' comparisons such as this.