yes changing exercises on a full body workout ..eg incline one workout flat the next.
I think as you wrote the "Bodybuilding Look" has changed in some ways but Bodybuilding is about sculpting your physique regardless if Natty or not.
even a guy doing push ups wants to build his chest ..otherwise what is the point?
Agreed about bodybuilding.
However, Marines do pushups to improve performance and strength, not to improve their aesthetics.
As far as the exercises you could also change every 6 weeks or even several months.
It's hard to progress if you change all the time.
What should be noted about Reeves training is that the routines shown were shortly before contests.
This is true of about all the routines in the mags. Lots of volume, lots of reps and sets to get defined.
If you train with a few basic exercises you will look better. You don't need 15-25 sets per bodypart.
You can develop your upper body doing just a press and a row.
Your lower body doing squats and calf raises.