This article talks about binding the body versus approximating muscles, as the splint does.
I personally do both approximation of the muscles with the Diastasis Rehab Splint and bind my bones with something over the top.
The cool thing about the new neoprene model Splint we have, it can bind the ribs fantastically as well that get flared out a bit from pregnancy from 6 weeks to 6 months postpartum while the relaxin is still in the body! But you don’t have to be in that window to get great results from the Splint! I work with people into their 60s that get great results!