The energy to skate comes from your legs. That means every time you push off you are compressing the springs before you actually go anywhere. And the springs are likely going to be big and add a lot of mass and size to the skates. Skateboards have springs, imagine adding one of those contraptions to a set of inline skates. It would lift you up probably 2-3 inches and make the skate much longer. What does it get you? Not much. They only flex a little, the rest is handled by your knees anyway.
As someone else mentioned, the wheels themselves are usually the shock absorbers, as you can buy softer wheels to absorb more of the surface and not transfer it to you. It’s actually the same with skateboards (has nothing to do with the the board being flexible it’s all in the wheels). Ramp wheels are usually hard, about 99A-103A durometer, where as street would be about 78A-83A, maybe 85A. The lower the number the softer the wheel and the faster you actually go. Softwheels usually also require a hub to stop them from falling in on themselves. It’s similar with inline skates, except they usually top out at 90A.
https://inlineskateworld.com/inline-skate-wheels-a-guide-to-wheel-sizes-and-wheel-hardness/
You kind of answered your own question – you already have knees. Your knees are adequate enough to handle whatever small terrain disturbances there are while riding on skates/blades in normal conditions.
So why add extra stuff that isn’t needed? Extra shock absorption or springs just decreases the responsiveness of the skates and adds weight, all just in case you ever skate over a field of rocks, which you won’t.
I inline skate and I feel like my energy transfer would be very hard to judge if I had spring in my jump. I can lock a 3cm right angle on a rail or a ledge 9/10 times. I account for how high the rail is and how high I need to jump. Adding springs just means I have to judge the height of the rail, my jump and whatever extra the springs give me.
I’m currently recovering from that 1/10 times I don’t land on the rail properly hahaha. There are companies that make exactly what you are talking about though.
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