Another issue is the possibility of getting junk caught in the jaws of the trap on the side of the coni facing the ground. A stone or stick in the jaws can cause the other side of the trap to not close properly. As the trap goes off it will jump off the ground and the jaws will have a good chance of grabbing whatever is on the ground under the trap.
For me, reach ins with coon were solved completely by going to 22" deep boxes with the trap at the front in slots and the bait right in the back. If there is no chance of being able to grab the bait, they will try to walk in closer first.
And swamp wolf, I don't think anyone is saying it wont work, or wont work well..just too powerful and not designed for it and he cons out weight the pros of using a foothold. I would list the following points as negatives
-increases the risk of bad things happening in the case of an incidental
-a lot of weight and leverage on the trap itself causing broken bones.
-a conibear, even on a drowner has a lot more metal, springs, etc that can catch on exposed roots, tangle in wire, catch on rocks, etc and prevent going down the drowning wire, wheras a foothold has less chance of this
-Angle of pull. A conibear is not baseplated and the angle of pull can cause more damage (some footholds aren't as well)
-should you not want a drowner, a laminated, or laminated offset trap is WAY easier on a foot than a coni, which arent laminated
-a coni has a good likelihood of a high up catch, meaning more discomfort for the animal caught. An animals feet are tough, an animals thigh not so much. Foothold, not leghold.
-less chance of chewing in a foothold
-chance of debris catching in opposite jaw and preventing a catch
Some points are weak, but collectively, I find that its just not a great idea.
I mentioned under ice earlier, A drowner is about as fast, but under ice stuff happens. I always am nervous setting the magnum conibears on shore where someone could drive by in a boat and see a poorly caught critter stuck in a trap. Granted, that did not happen this year, or last year, however it has happened where a critter has been caught by a tail, or shoulder and I have worked hard to mitigate this with good success. Setting purposely for this doesn't fit my pursuit of humane trapping, drowner or not.