Well, I used to think that too. Then I had the experience of hitting a wet clay pan in a brand new ranger still on road/factory tyres...
I was slowly sliding downhill into a strainer post, and went hmmm. Into 4wd, that did f-all and if anything I slid straighter down the hill and not pivoting around the stationary fronts... Tried the left foot on the brake trick, the slight bit of handbrake trick and went well this is a f-up. No way to pull forwards (nothing in front) nothing to pull back on, no one else around and literally a brand spanking new truck vs strainer post!
Well, try anything once. Into 4L, and the new fangled electronic diff lock. F-me, it made a hell of a racket but drove straight out like it was on concrete. I looked at me wife who was with me and she had a look on my face like what were you doing wrong you tosser! I explained what it did and how it worked and she looked at me with the blankest expression (it was actually quite cute) so I just had to go and do it again to prove what I was saying. And that was on wet clay - the stuff you just about can't stand on and tread style or air pressure really doesn't make that much difference... So tech done right can basically trump all.
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