That still wouldn't be the soundest mechanic, either. There would still be potential for large amounts of elements on-screen. Plus dismemberment and blood. Oh, and I'm not sure about respawning mechanics? If any.
Also bear in mind that in controlled locations such as cities, the ability to cull areas is increased dramatically. Open land is far more difficult to slice.
I wasn't refuting ragdoll in the game. All the corpses, as far as I can tell, 'spawn' into a ragdoll state once they finish their death animations. What I'm saying is you can't exactly 'push' corpses out of the way on all terrain. Swamps? Maybe, but monsters look considerably more massive than their human counterparts.
On an unrelated note, I did notice, as with many other games, that during the dialogue scenes with Johnny, Geralt's tassels and hair seemed to shake at every cut. Maybe due to his model being culled when off-camera. It isn't a huge issue, but looks a bit out of place when noticed.