Sure, Ive used big pots like that for mud bugs (not Cajun, Lemon and dill instead), booyah, and flashover fishboils to entertain people from out of state when at home but how often are you going to bring that kind of kettle to cook at a campsite for 50+ of your best friends?
Right.
If youre going camping with the family youre probably hauling in via vehicle or trailer then you can bring the cast iron. That takes even less effort to clean. You just put it on/under wood and start the whole pile on fire. There, its clean.
If youre going lighter than that and youre really worried about soot on your enamelware then horsetail (scouring rush) and/or ash works fine.
I dont think Ive ever seen a hiker/packer/scout type ever care how much soot/char is on the outside of a mess kit.
Sort of a handy tip I suppose but one of those thats going to be packed way back in the archives of the memory index.