One problem I see with such a solution is I have no fences (can't afford to fence the 5 acres, and there are dogs, coyotes, wolves and various cats including cougars in the area. This poses a problem with the bbq's at times, let alone a flimsy smoker made from a cardboard box! Not to mention it rains. I have seen a variety of smokers made from many things, but while it would work, why would I bother with something that has to be renewed every time I want to use it. The oldfashioned drying rack my ancestors used would work just as well, and be a site more permanent, although you might loose some sleep trying to keep the animals from it!
I think your point is that there are solutions out there, some people can use them, some can't and some don't want to, they want all the hard work done for them.
Not everyone has the skills and the tools to make a smoker, or even adjust a prebuilt smoker to work well. My older cousin at one time had a smoker built from a 1940's Fridgidaire but he could make it, this was way before electric smokers were in the sporting shops and WalMart. My brother's solution was to make a stick frame (lots of trees around on our property) and a fire, and racks from the green willow sticks, and smoke his fish the old way, it started to rain so he got some taller sticks and put a nice sheet of builders plastic over top, worked just fine, the fish was good, and he was happy.
I will admit, that so far on this site I have seen more complaints about the smoker's than praise for them, and people are building or modifying their picks, more than they are saying how great the smoking is. But that doesn't stop me from working with what I have and if it doesn't work well, will find a work around solution and keep on going.