If they are holding their skis on their edges, then it doesn't make any difference whether they are at 10 degrees to the snow or 60 degrees. You are still supporting your weight (plus other forces) on a longer lever. I don't ski anywhere near the "high angles" you define, but I can feel wider skis (initially, more in my ankles than the knees). What I agree with is that if you do have those higher angles, then you have a lot of centripetal force in addition to your weight, and the forces are therefore higher.
The quads (or some other leg muscles) are what stabilize the knee, and what is holding the knee in column against the sideways leverage on the knee.
The quads may be strong enough to handle the combined forces on a 68 -- but doing the same on the 88 is much more force. And, by the way, the lever arm may be more from the ball of the foot (rather than the center of the ski) and the edge, in which case the 88 may be 300% greater than the 66. I don't really know the bio-mechanics. Just my opinion, I'm not a medical guy.
Comparing feelings is meaningless unless we are talking about the same thing.
I agree that you need to be talking apples and apples to make a comparison -- my point is that there is a lot more to that than the edge angle and that you were focusing on the wrong thing. Someone skiing GS turns at mach schnell will see just as much or more force difference at much lower edge angles than you will skiing your definition of high angle turns at 1/2 that speed.At 62 years old, I can feel the force difference skiing MY definition of high angle turns, and my hip is a LOT more than 12" off the snow ( 
often as high as 18-20).
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