I don’t think most people today torture their mature plants in the home stretch anymore. I have heard of the wedge method in the stem and a modified version with an iron spike. No one that tried this I know ever reported it be revolutionary. I have heard back that bunnies love it when you do this because they love chewing cambium layers. (They do this to fruit tree whips all the time too at grafts, but that’s another story.)
The second method you mention I have used a lot. Popping the inner stem. But never on mature ladies in the home stretch. I have done this a lot in veg and early flower.
I wasn’t sure if you meant crack the stem open.? I do not. I am careful to just crack the inner stem. The purpose of this is to fatten or strengthen the stem on floppy plants that tend to overgrow their stems. Not on plants finishing up. I think the grow trend now is to torture in veg (tie down, lst, scrog, fm the tops, top the tops, etc. All the “torture methods” work best (most benefit) early because the plants can heal. Once they are finishing you don’t want the torture. It could impede the last floral growth.
The only exception to that, I hear people use a lot, is perpetual darkness a few days at the end. For the reasons you stated. Add more resin to swell the trichomes. I grow my harvest outdoor so I have never tried this myself. But it makes sense. I am sure there are people in here who could add more here from their experience about dark endings.
My torture chamber of whips and chains is reserved for seedling and new strains I am trying to figure out. I torture new seedling from breeding projects to see how stable they are. Specifically you don’t want the backbone of a 5 yr breeding project to be an intersex plant if it stresses.
Or if I get a lovely clone only cut of a girl I just have to try and breed with. I will take a clone of that clone and get it flowering. Then I leave it in the dark. Then leave it in the light 3 days. Then dry it out till it almost dies. Then leave it half submerged in a bucket 3 days. Then crank it up in the 90s (f) a couple of days. Then leave it out in a snow bank a few hours or in the fridge. Etc. just waiting for a nanner to get some pollen. Anything you can do to stress it out during flower.