Many years ago, this was effectively the only way to do anything. JSON was created in response to how bad an idea pushing things down and running them through "eval" is, as are the rest of the technologies you are presumably reacting to.
Nobody can stop you and if you're one of the rare handful of people with enough discipline to prevent this from blowing up in your face, go nuts. But please don't go around telling people how wonderful this is without considering the history of why we all don't just do this all time, considering it's actually easier in terms of raw effort than actually using JSON et al properly.
