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.
you aren’t supposed to sit on the saddle over bumps. you lift up your butt and use your knees/hips to as the suspension.
I know, I do, and that’s good advice. but suspension seatposts are still nice for minor stuff especially on longer rides when you’re tired.