"Purist" peddlers tend to view the suspension post as an abomination. But since I have already been branded a heretic, for my eBikes, I would like to expound on the benefits of the suspension seat post.
1st off ... it is much gentler on the butt, buffering every bump and jolt towards the bearable.
It's nice that when you pedal harder it raises you into a more aggressive stance.
Most important! Reduces-buffers the pounding your poor bike takes from that massive brute on its back! ... Every bump a 180lb'er feels is 6 times as abusive, for the poor 30lb bike.