I’ve wondered the same about high rep squats with a good load of weight. You would think there would be some benefit there for heavy packers
20 rep squat cycles seem to work really well for some people and just ok for most people. The general consensus that I have gathered is that all in all, the results don’t justify the effort. Keep in mind that going in and squatting 20 reps twice a week and adding 5# to the bar each time will get brutally taxing very quickly. It may start to impact progress on your other lifts, especially deadlifts. You may even regress. You usually start a 20 rep cycle right around 50% of your 1 rep max. If you run it for 6 weeks, you’ll be 60# heavier than when you started. Some young, genetic outliers will take it all the way to the former 1 rep max over the course of 10, 12, 16+ weeks.
The problem is, you can’t expect to start adding in a bunch of conditioning volume, LSD or HIIT, on top of this 20 rep cycle and still make progress, especially if you are older than ~35 or so. While there is certainly appeal to it because 20 rep squat cycles involve a lot of suffering, I think most average joes are going to benefit more from squatting increasingly heavy sets of 5 + some conditioning. If you want to move heavy weight for conditioning, pushing a sled for short intervals is productive. Then, of course, you’re going to need to do some rucking as you get close to hunting season.
In the end, it’s not so much that the program is ineffective or not time efficient, it’s just that most people aren’t going to be able to do a whole lot of anything else and still benefit from 20 rep squat cycles because after about 3 weeks in, you’re going to be tired and sore and need almost all of your recovery resources to continue to benefit. Also, my personal observation from these cycles back when I did Crossfit was that most people will drop out after 3 weeks. (In the case of Crossfit, that involves conveniently not showing up on the two nights a week where 20 reps are programmed after the first 2-3 weeks, but also, most people would just fizz out entirely because of the amount of random junk conditioning thrown on top of a 20 rep squat cycle that requires the vast majority of your recovery resources). Also, you’re not doing a program if you are throwing in a bunch of random volume just to do it. There’s a reason 20 rep squat cycles are minimalistic.
Some people just want to complete a marathon, other people just want to squat 405# for 20 reps. Both of those are fine, possibly even noble goals unto themselves that require discipline and hard work, but that doesn’t make either efficient training methodology for other goals like being in shape for elk hunting.
All that being said, I’m not sure we have seen actual true to form attempt at a 20 rep squat cycle as it relates to training for the outcome of of being in shape to hunt, so, if there are some willing guinea pigs, take a stab at it and log your workouts on here because the process and the end results would possibly be beneficial for the sake of posterity.