Yeah, I feel like for most applications the online part acts more like a backup than an interactive sync. How often do you really work on the same file on different devices? And if you do so, how often do you want to continue working on an old version rather than first forcing a sync of the latest revision? After all, without a sync you can't continue your work but only edit completely unrelated parts...

I think most real-world applications fall under either "has to be done online", or "if there are conflicts, keep both files and let the user figure it out". Trying to automatically merge two independent edits can quickly turn into a massive mess, and I really don't want apps to do that automagically for me without giving me git-like tooling to fix the inevitable nightmare.