Didn’t Agassi famously say that when he tried poly, he could hit the ball out and have it land in? That implies that he could use much more powerful strokes on an average basis and still keep the ball in play
From anecdotal experience, I’m tall and my serve mechanics are much more professional than the rest of my game. My first experience with poly was that it became trivially easy to kick serves up over the heads of short people. I don’t usually play with a full bed, but when I do I’d have to really mess up to drop serve against a short player. I can imagine the difference in what pros are able to do with the ball off the ground feels similarly or more monumental to them.
Personally I think they should regulate the strings, but also racquet head sizes, racquet composition, and range of swing weights. Where we are now is like if the NHL never regulated the size of goalie pads or the MLB allowed aluminum bats.
A similar situation might be where the NHL allowed composite sticks, and as a result wood sticks completely vanished from the league in a few short years. The composite sticks greatly improve shooting potency. The NHL allowed this change because goalie equipment, goalie technique, and team defensive systems had really reduced offense and the league wanted to increase offense. Probably similar to the ATP wanting to get away from one and done S&V of the Sampras era on fast courts