Not even trying
[...] there's no record anymore of what the document said before the change. The paper copies in my drawer can't be changed and I can pull them out to prove that yes that was what was originally specified.
This is an issue, but it can be mostly resolved with versioning filesystems like Files-11 or maybe even ZFS snapshots. I can't even tell you the number of times I've made changes to a document then wish afterwards I still had the original version...
A committee takes root and grows, it flowers, wilts and dies, scattering the seed from which other committees will bloom. -- Parkinson