Actually no. I saw matches in the 2000's as well where we had a period of fast ball and Australian runners all over the place. Same fast ball where Dougie Howlett scored some tries from fast 2nd fase ball. Suddenly trys dried up and the ball slowed up at every ruck. All you do now is you hold your hand on the ball at the bottom of the ruck where the referee cannot see and they cannot do anything to free it up otherwise they will get pinged for hands in the ruck. Yes there were some mountaineering but that was foul play. But you spoiling ball got something for your troubles. There were more faster ball and less infringements.
Other thing is it seems to me people do not know why they take a while at time to pass the ball at a ruck. Well it is simple. At a tackle, the attacking team usually has to commit more players than the defenders need to.
The attacking team has to commit a cleaner to secure the ball, and two guards on either side of the tackle. They also need a scrumhalf to clear the ball. The defenders need commit only the tackler and the rest can fan out in the backline.
This means that there are 10 attacking players left in the backline, but for the defensive team, there will 14 men on defence in the backline. Now 10 men will hardly ever beat 14 men and so often the attackers will slow things down, moving players out of the tackle/ruck and into the backline to gain more numbers in the backs. Then they can attack with greater numbers and have enough players to secure the ball at the next tackle.