Seconded.

Here's the problem: when someone argues that some techniques might not work for some people, their objective is not merely to achieve epistemic accuracy. Instead, the real point of arguing such a thing is a form of self-handicapping.

Because of course it is impossible a priori that any technique works for one person but not another. Furthermore, it is impossible for anyone to arrive at this conclusion by an honest mistake. They all have impure motives; furthermore they all have the same particular impure motive; furthermore P. J. Eby knows this by virtue of his vast case experience, in which he has encountered many people making this assertion, and deduced the same impure motive every time.

To quote Karl Popper:

The Freudian analysts emphasized that their theories were constantly verified by their "clinical observations." As for Adler, I was much impressed by a personal experience. Once, in 1919, I reported to him a case which to me did not seem particularly Adlerian, but which he found no difficulty in analyzing in terms of his theory of inferiority feelings, Although he had not even seen the child. Slightly shocked, I asked him how he could be so sure. "Because of my thousandfold experience," he replied; whereupon I could not help saying: "And with this new case, I suppose, your experience has become thousand-and-one-fold."

I'll say it again. PJ, you need to learn the basics of rationality - in this you are an apprentice and you are making apprentice mistakes. You will either accept this or learn the basics, or not. That's what you would tell a client, I expect, if they were making mistakes this basic according to your understanding of akrasia.