The important point to keep in mind is that SQLite will read JSON5, but it never writes it. The JSON that SQLite generates is canonical JSON that is fully compliant with the original JSON spec.

It turns out that there is a lot of "JSON" data in the wild that is not pure and proper JSON, but instead includes some of the extensions of JSON5. The point of this enhancement is to enable SQLite to read and process most of that wild JSON.

This feature was requested by multiple important users of SQLite.