I have to agree with this.
Whenever we change a rep range or start a new exercise, we can progress every training because of neuro adaptation. Thats why it SEEMS that stuff works for that amount of time. In reality, i am sure as hell that just because you change stuff more often than me, for example, it wont give you not even 10-15% more gains.
I believe there could be some benefits to do this, but those wont be actual hypertrophy related - more like functional, maybe.
Most people know my opinion already but ill just re-spam it again here - unless you under-eat, under-train, over-train or train intentionally stupid, i dont think that some specific exercises, rep ranges, changing stuff, or changing drugs even, will produce noticably better actual gains.
I like how @Paul_Carter said about volume - if you are not growing of 15 sets a week, adding 5 more extra sets wont be a game changer.
And since bodybuilding and strenght stuff are both physiological topics, the same principles would apply all across. So if shit is not doing much, adding volume WONT make you explode to epic size gains. Just like adding an exercise wont. Or doing and exercise in a specific angle. And yes, also by changing rep ranges or programs or whatever.
I do believe that there might be some difference made with these parameters, but i believe its like 1% and it would be noticable to some pros. Like if you go for 502kg deadlift, that 1% means a new world record. For my shit deadlift, 1% is nothing so its not even worth to bother.
Same with size. Maybe to some pro, that 1% advantage of some specific angle or rep range changes enough that its noticable on stage compared to others, but not to any of us here.
There are tons of methods, theories, programs, and anecdotal evidence, but one thing is common :
1)There are genetic freaks that will explain their success with one of these parameters.
2)There are MORE people that are shit in these sports, doing the exact same things.
So it all comes down to this… if your basics are set well, you progress the way you progress, and nothing you change beyond that wont produce noticable gains.
But thats just my opinion. If someone thinks that changing stuff often really helps, i would like to see a picture of “now” and then a comparison of “later” in like 3 months and lets see if we can spot the H000GE gainz.