I know this is veering off the course of discussion a bit, but I think I'd prefer to stand in shit with my bare foot than with a shoe on, because it's much easier to clean off. Unless I haven't got anything to hand to clean it with and I've come to the field wearing shoes.
The difference is that shoes that are fully enclosed need to fit you pretty well to be comfortable, while for something open like a sandal that's not nearly as important