If you don’t want a part of your body to get sore, then that part shouldn’t be pushing against something that doesn’t move along with it. That’s the thinking behind the vabsRider bicycle saddle, the two sides of which pivot in time with your pedaling.
This looks neat. I imagine it would feel weird after riding a fixed saddle all my life. My main concern would be durability - how well does this hold up after cycling 1000 miles? Or when it gets thrown down in the mud 100 times, or shoved in a car trunk 100 more? There are a lot of moving parts, so my best guess is that it would break relatively quickly.