[Filligree]

You can’t put comments in JSON, while that’s fairly easy in CSV. This makes JSON unusable most of the time for human-editable data.

[imtringued]

There is no such thing as a comment in CSV.

[Filligree]

In many dialects there are. Usually you start the line with #.

Comments will happen. If your file format doesn’t allow comments, then people will make up an extension to allow it. This is true even for binary formats.