You may have a point, Blunted, but if you are correct, there are two kinds of revisionists. The first, which one sees in young writers and hide-bound politicians, is a person who refuses to change anything. Everything is done and perfect. This revisionist may eventually change a work or position, only under great pressure, for personal gain, or to save face, while maintaining that nothing has changed; all is going "according to plan."
The second type of revisionist, from which Welles emerges, welcomes intelligent change, seeks it out, incorporates the "happy accident," encourages cooperation, into his/her thought and work, following an underlying set of principles or morality.
In these senses, you are right; we are all revisionists. There are, however, many fewer of the second type than the first, I'm afraid.