doing PPP my deadlift has gone from 147.5kg 1rm to 165kg in 11weeks. Squat has gone from 117.5kg to 135kg and bench 105kg to 115kg (and hopefully higher Next week). In that same time I have still been able to do the exact same weight or more and same volumes on all other exercises I would usually do on the same days.
I have only been doing 1rm based training for 1 cycle of PPP because I needed to change up the way I was training to keep making progress, but it works and I like it. I have been lifting for about 18 months and have no desire to compete in powerlifting or body building at this stage, but its much more satisfying to see the numbers going up each week than staying the same.
You will see the light soon enough birds, you only have to look at all those videos of the Gus Markos trains to see his methods work...