Which techniques do you have proof increase quality/potency by stressing plants?
I have yet to see any evidence that anything you mentioned (lst, sipper cropping, splitting stems\nails in stems, etc) increase potency. I would consider those all myths that aren't supported by science, just vociferously defended theories based on subjective experiences. Which in my experience doesn't pan out. A lot of growers work in isolation, "all my friends say this is the best dope ever" is a very common line from growers because they lack context. Any homegrown seems great compared to commercial. I think this is what creates the illusion that these techniques work, that and some are inherited. Like the nail through the stem, I believe that was mentioned in "how to grow your own stone". I've never seen anything to back that opinion up though, just other people who agree with that opinion.
If you have any studies to show the increase caused by stress I'd love to read them. From the first couple & the last page of this thread I'm guessing you're just defending your opinion based on what you've read.