Well, when you are in the middle of development and changing names, OK. But if you go back in after this is working and start changing names then that is like playing Russian Roulette. The very same argument could be made for any single piece of code that has a string key, dictionary, etc. So while you may refactor your code while developing it you would also still recall this needs to be modified. But if you are changing "keys" after this code is already working, then you obviously would have a good reason, but this really should be a moot point. But that is just my point of view.