why not version control those things? if they're static, there's no changes so version controlling them has little cost. maybe existing tools aren't adequate for this conception of the world, but I don't think that's a good reason not to work towards "version control everything"

Cost of keeping all data (up to +100%). If they dont change, no point of really versioning them. Backup of those is simple either, whatever syncing software (incremental).

Docs that often change, its completly different story. I love VCS like features where I can slam 'dot status' to see whats going on, commit when I feel I need snapshot, sync to whatever device I want. And because I run DVFS I dont even bother with backups because I have multiple copies of repo with entire history.