I agree with Sean.
I posted in another thread that the PGA Tour scoring average on par 5s in 2018 was 4.65. Basically, there is no such thing as a par 5 on Tour because they are all (even 600 yard par 5s) reachable in two by most players.
If the max par on Tour was 68, then it would seem like every course just got a lot harder without ever changing the course. At the Farmer's, instead of Rose shooting a winning score of -21, he would have a shot winning score of -5.
If defending par is so important, just change the scorecard. That's a lot better for the game overall that changing courses and trying to add distance everywhere.
Also, make the occasional 290 yard hole a par 3 on Tour. Now, scores would be measured against a par of 67.
The most exciting and testing golf is the course/hole that can yield birdies but disaster lurks everywhere. Length is not at all required to make that happen.