Another issue which git won't solve is if you collaborate on text which has "structure". For example when merging indented (todo) lists as flat text, bullets might end up in the wrong place, e.g.

  [ ] Project
      [ ] Don't do this
          [ ] Task A

While offline, user #1 adds '[ ] Task B' and '[ ] rm -rf /' under "Don't Do This", while user #2 adds '[ ] Do This' under 'Project'. Obviously you don't want to merge this as:

   [ ] Project
      [ ] Don't do this
          [ ] A
      [ ] Do This
          [ ] B
          [ ] rm -rf /

We're working on an app [1] which needs to deal with this, but in general it also makes git less suitable for things like outliners or other collaborative text editors where people can work on lists, tables, and so on (structured data basically).

[1] https://thymer.com/