Whether your desire to have a clean, perfect document is pathological or simply a result of the way you want to present yourself to the world, we are eliminating some of our finest work when we edit ourselves online, on the computer screen, in our writing programs.
For me, at least, the issue is that my thoughts can come and go so quickly that I can't even get them out on the page (virtual or otherwise) before they disappear into the ether. It's even worse when I try to write stuff out longhand, which is only legible to myself, and even then, only barely.
On the other hand, I know I can obsess over my words. Even a 140 character tweet can sometimes take an eternity for me to write. And I know the minute I hit the post button, the information is out there, in the ether, indexed, and searchable nearly instantaneously. Even if I decide to delete the post, someone can screenshot it and reshare it without my knowledge or consent. Further, I have no control over it.
At least with a piece of paper, you can destroy your own work. Obviously it's a bit harder once that piece of paper is part of a larger book that's printed and distributed to a bunch of people, but it's still theoretically possible.
Meanwhile, that searchable, infinitely copyable aspect of computers also makes it possible for culture to spread farther and wider than it could ever do in entirely physical mediums. That doesn’t sound like killing culture to me, but it’s definitely changing it.