I have a semi long winded opinion on this, mostly backed by unscientific observations in the game.
The training I did before my injury in 1997, resulted in gains of 1 full club in irons, and 8+ yards of driver carry. This with all the same equipment as I started with. The evolution of training methods is pretty staggering.
I am now NOT training, fat, and never practice. I hit my driver 5-10 yards further than I did before my injury. I also have learned to hit the ball at 12 degrees launch angle instead of 8.5 as I did when I played. My driver is 1 inch longer than my go to driver of 2001.
My irons are 1/2 inch longer, and 2 degrees stronger, Callaway blades. I have tried every ball on launch monitors, and found and optimum number that gives me distance with the ability to still shape the ball.
I played a few holes a year ago with a ProV1 and an old Maxfli HT 432. On tee shots, there was virtually no difference on the 3 holes I hit both. In fact, the Maxfli was a little longer on 2 holes. Irons flew pretty much the same. I was pretty shocked!
I have students who are training hard, have perfectly fitted equipment and can just generate crazy club head speed. The lighter, longer clubs, and forgiveness allow this speed to work well. The kids are pretty ripped, and much bigger than when I was playing in the 90's.
I am an ODg fan, grew up in new Jersey with access to many great courses, and understand the concerns about these courses being left behind by the professional game (and high level amateurs). BUT, I have still not seen a great course that has been left behind by it's members due to the new equipment. I hate to see great golf course overreact to less than 1% of golfers and their ability to bomb it.