folks make jokes of stuff like a kipping pullup but in a real world situation, if you were supposed to climb up on something, would you pull yourself up stiff bodied so to only work your arms? Nope, you'd use your whole body to pull yourself up. It trains you to feel, move and use your whole body to accomplish tasks. Not just your extremities.
You kind of make it sound like a cult we dont do normal things like other people we will pay anything to do crossfit 24/7
If you have to pull yourself up a wall falling about and humping the wall won't help, brut strength will get you over it.