dvcochran
Grandmaster
There is some physics that would argue that point but I was told the benefits of reducing elongation is better on the joint.A couple of bits to add to/adjust on this.
I've read that the repetitive motion of crunches is bad for the back over time. I've also read that stopping squats at horizontal keeps the knees at their highest stress point duing the hardest part of the squat: the reversing of direction.
I do know my knees first began hurting in deeper bends when I was in my late 30’s, earth 40’s.