I don't see how scores, relative to par, indicate how good of a 'test' a course is. Par is just a number. Would it be a better test if the course played to a par 64? Players played against each other, not the course.
I agree that par doesn't matter. If you called a course a par 18, the golf wouldn't change at all. On long par 4s vs short par 5s, I'm sure they set the pins up differently though.
But to me, the issue is that the gross scoring is decreasing to a point where it's mostly GIRs and easy ones at that. When the top 5 players on the PGA tour average a 2nd shot of a PW/9i into all par 4s and 5s, the courses are no longer good tests. They aren't testing much except the players' ability to throw darts and make 10 foot putts.
On the web.com, 34 players averaged less than 70 shots per round for the season. In 1990, 0 players did. In 2000, 0 players did. Guys are just bullying the golf courses now. They aren't really being tested. 1 player shot 41 straight rounds of par or better. A guy went 220 consecutive holes without a 3-putt. Someone hit 38 straight greens in regulation (and I'm sure a lot of them in under regulation). In fact, 96 players on the Web.com tour this year had at least 1 streak of 18 straight GIR.
I know it is an opinion, but to me, this kind of golf is dull at hell to watch. I want to see some level of adversity out there to see who has the heart of a champion. I don't want to watch a putting contest.