1) a lot of people I know would be very happy working with a good facsimile, or would not want a critical edition that changed the manuscript readings in any way. (In fact, I know a lot of theorists [not I] who hold that monkeying with the reading of an Ms is unwarranted intrusion to keep the profession alive and 'needed')
2) no one asked us to play a role in the development of writing systems, or printing, or typewriters, or book production. One could argue that this time we are lucky to have a hand in the development of computer methods - but one could just as easily argue that there is no more reason for us to do that than there was when those other methods of textual communication were being developed....