The only real thing that is required is functionality. And it will be most likely the only thing that will stand in time (among many other things that any given

The only real thing that is required is functionality. And it will be most likely the only thing that will stand in time (among many other things that any given useful application might have). The author, the target platform, the product philosophy, and all the other little things are just attributes meaningful for enthusiasts (that goes away with time).