I remember when it was the dominant way to play and win in pro tennis.
Then several things happened. Bjorn Borg proved you can win from the baseline by by being extremely fit and running down every ball and putting it back in play. This style was more effective on red clay, but also worked on hard courts. Fitness and a good diet was almost an after thought in tennis in the 50's 60's and even 70's. Beer drinking by the pros was a big thing after matches
Points were short, mostly due to serve and volley or chip and charge tennis. Of course this was with wooden racquets, which I played with until the 70's when the steel Wilson T 2000 racquet came out followed by the oversized Prince racquets with the larger sweet spot but used mostly by amateurs.
I don't know if tennis balls are made differently, but in the old days serves were not hit at 130MPH. I would guess more in the mid 90 MPH range for men and 70 MPH range for women.
Using top spin was difficult and rare back then, so you hit flat forehands and slice backhands with one hand. Some people started hitting two handed backhands and that added power from that side.
If there was any desire to make serve and volley tennis viable again as a winning strategy, they could do it by slowing down the balls, but that is not going to happen, so we have two guys or girls hitting as hard as they can from the baseline. I also find this a little boring to watch but I still watch.