Thoughts and opinons about why they way we train today is better than the way they did?
Old School training/New School training, it doesn't make a difference in the real world. As long as one follows a few rules(putting large compound exercises before small ones, eating enough, resting enough, etc....). You'll get bigger, lean out, etc.....
The biggest difference between the different eras in bodybuilding is the use of of steroids and other ancillary drugs.
The biggest differences between the different eras in powerlifting is a) drugs b) the use of suits and c) tweaks in technique.
In Weightlifting, it is a) drugs b) a better understanding of technique.
You read enough magazines through the years, and you'll see that all these programs get recycled from one person to another, and that any half way decent program will get the same results as any other.