Slope wasn't universal until about 1990. It was a game changer. I played a course today that had a course rating of 70.3 and a slope of 145.
I played some competitive amateur events 50 years ago and qualified for the provincial (state) championship with a 79 playing off an 8 handicap. Today neither that handicap or score would qualify for anything. Competitive amateur scoring is way better now than it was 50 years ago. More players, better training, more competition, more specialization - there's no comparison.
Lately I've been watching replays of hockey games from the 1960's, 1980's and 2010's at the highest professional levels. The difference in skills and abilities between now and 50 years ago is astounding - they skate faster, pass better, stickhandle better, shoot harder and are better coached and play more of a system. Most sports have moved ahead remarkably - golf is no different.
Tommy, could you name the course you mentioned above - the rating and slope seem to me to be out of whack with each other if you're talking about the rating and slope from the same tee. I'm just curious.