I have used a Benchmade folder for my initial field dressing chores for many years now. I have a pile of fixed blade knives too but they seem to stay in camp or in the truck and only get used for skinning and butchering on occasion. I have a varied collection of fixed blade knives and it seems they come and go in many cases.
About the only drawbacks I find to using the folder instead of a fixed blade is that the mechanisms get a little fouled with tallow/fat/blood and when I put it back in my pocket I sometimes get a little blood on my bluejeans. These aren't real significant problems just issues that cause a little extra wiping of the knife before I'm done with the work.
I'm a dinosaur I guess in that I always have a folder in my pocket and I see little need to pack along a second knife while in the field hunting. I especially like the partial serrated blade on the folder for cutting through the brisket on deer while field dressing.
In this picture there are some I use (and one I just received as a gift and is yet unused - Mission Knives MPK). My years old Benchmade folder is in the middle and I have two other folders as spares. The fixed blade knives vary, one is a WWII Theater Made knife used by my father in WWII, there is another like it that I personally made, a couple Randalls (gifts) and a vintage Buck 105.