The main issue is not actually the ref blowing set restarts.
It is actually the threat of it. This obviously has sped the passages of when the ball is in play up enormously.
Momentum being too hard to stop is the problem.
Fatigue causes dropped ball, lazy high arms, deliberate attempts to slow the ruck, etc, which cause more possession to the opposition which leads to even more fatigue.
It's an endless momentum cycle that is clearly too hard to reverse, even for the best sides.
Essentially, we have gone too far the other way, and taken options away for teams to remain competitive within the contest, once a couple of small things go against them.