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I have no idea, and I have no idea why these discussions on here always seem so devoid of physicists and/or engineers. Fuck, now that I think about it, it seems like physicists would love skating.
Because skaters generally don't care about science one bit, even if it's related to skateboarding. They're more interested in marketing and what they've been told is true than the actual science of it. 
For the most part, the equipment we have works well enough. I've seen many new innovations over the years and they've almost all failed. Some worked well (composites) but did not live up to the feel of 7-ply maple, while others, like Powell's Boneite, turned out to be complete shams (George Powell also studied engineering at Stanford, so it's no wonder we're skeptical of the latest invention).
On the other hand, you'll see many threads discussing taking outer shields off their bearings because they sound loud (when filled with dirt) and therefore must be faster. This very website gave some concession that holographic griptape could assist with balance during tricks.
BUMP
Fuck it, I may be outing myself as an idiot but I dont believe physics can always apply to skateboarding because there are too many factors, landing with your feet 1 inch different or landing heavier toe side or heel side, type of concrete, speed when doing your trick, so many factors I think it would be hard to account for all of them with numbers. Its trial and error. If we trusted science everytime in skateboarding we would all be skating the powell boards mentioned above.
Physics Teacher here:
Physics applies to EVERYTHING. You want to ollie higher? Hit the ground harder (Newton's 3rd Law). But that doesn't mean we need to ride powell flight boards. It may mean they are less likely to break, but there is a lot of room for personal preference.
As stated above me already, if the riser has the same contact area as your truck, there will be no effect on how likely you are to break your board.
I like the thought about the squishy type risers compressing at a different angle and therefore applying more pressure to the front of the baseplate rather than even distribution, but that would likely be offset by extending the time over which the force is applied, which reduces force overall. The impulse-momentum equation is Ft=m𝛥v
Meaning: any change in speed (𝛥v) for a mass (m) is caused by a force (F) applied for a certain time (t)
Since F and t are on the same side of the equation, they are inversely related...any increase in the time it take to stop you when landing on your board is offset by a proportional decrease in force applied.