In any thread on these topics I feel that there will be a number of people reporting their relatively recent smashing success with some method. I’ve had multiple smashing successes myself, lasting over a year, but have always eventually slid back — and then never replicated the success despite lots of effort using the same method. It hasn’t been until I switched to something different that I’ve found success again.
It’s like the body eventually learns both physical and psychological tricks to accumulate energy under any regime.