People have been doing this for years to help with traction and articulation when 4 wheeling extreme trails. Leaf springs have a tendency to wrap and cause wheel hop if they are losing traction in slow speed rock crawling. 3 or 4 link won’t do that. They also flex/articulate better than leaf springs which helps win the RTI ramp competition.
4 links can be tuned to make the rear of the vehicle lift (anti-squat) or squat under power which helps with traction depending on what type of wheeling/racing you’re doing.