I tend to agree - but then again I never tried it either - thus mu questioning.
Also something to consider is that with just one or two pieces of velcro tape almost any tripod can be used as a monopod - or by extending just one leg. If the legs collapse/spread-out independently you can even extend one leg to the floor and use one or both of the other legs to pull into your torso for extra stability.
But even a tripod at a wedding seems kinda out of place. I can see it for still subject shots like the cake, the alter, some of the food, decorations, etc. But a pod (I think) is mostly for still subjects where you need a long exposure. At a wedding long exposures are going to work as people can't and don't want to try to freeze for 1/2 a second or whatever - and 95% of the shots are of people.
Now, I could totally see a monopod if I were using 2 or 3 flashes on long extension brackets or some other heavy rigging where weight were an issue.