How is this connected to the wooden racket?
I would like as well to see clash of styles, attack vs defense, S&V, baseline attacks, etc.
But I think it has to do more with court surface speed, poly strings and racket stiffness.
It has everything to do with wooden racquets as a topic. Like most other sports, it wasn't simply one thing that changed to bring it in to the modern era. When wooden racquets were the norm, it was a different game, different surfaces, different balls(even a different color - it's not washed out in the video, it's a white ball), nearly everyting was different. Wooden racquets were merely a part of it all. I have a Prince Woodie, and aside from the weight, one could use it to play a modern game if they wished. I use it to warm up with before doubles.
Pros do not, and never did, need a stiff racquet to produce power. Though the typical 59-64RA they use now is admitedly far stiffer than the 35-40 of days past. Having said it, pros always hit hard with skill and technique. It's sort of like golf or baseball - if you want to hit or throw very hard and fast, you have to be loose and use technique. In fact, after learning how to properly pitch baseballs in HS, I nearly instantly became a better server. Learning to coil the upper body and load up the arm, launch with the legs, and pronate the arm and snap the wrist. It is nearly identical to throwing a ball.
Some of the fastest serves ever in the ATP were off of wooden racquets. A wooden club wielded well gets the job done. Ask any baseball player.
What graphite allowed were larger head sizes that didn't break or flex too much. This allowed more arcing swings with more margin for error.
Gut, however, DID help with speed. I miss serving with my full gut POG mid - nothing had that feeling. It's now strung with Wilson Revolve
Poly allows more control, and with it comes more spin and the ability to hit out more.
Most people, even young ones, understand the surfaces are slower now than they once were. What many of us do not realise is the ball has changed as well. If you have an old tennis ball, one of the first things you notice is the size difference. New balls are larger. Some dramatically so. The rules state they must be a certain size, but I have even seen new Slazenger balls markedly smaller than Wilson USO balls. So they are also tailoring this aspect. Much of this appears to be the fluff affecting the size as well. But, I digress. In the old days, a smaller ball for the same(ish) weight, but with less fluffy outer coating is going to have better ballistic properties. Less wind resistance, and less volume for the same mass translates to the ball retaining more velocity down range - making it much more difficult to chase down even if it did bounce the same. Basically, it seems most major sports facilities have taken the old 'heavy duty' balls(that didn't also have HD rubber, just the thicker felt) and started using them across all surfaces.
Add in poly, then slow down the court AND slow down the ball, and it is an entirely different game than it once was regardless of racquet type.
However, I will agree that if you made pros use wooden 85 sq in racquets, even using todays tech sans synthetics but allowing poly, it would turn in to something more akin to the old game over night. But allowing everyone to use a Prince Woodie wouldn't change much.