> XML's saving grace was that it came with good schemas out of the box

JSON is inherently "schema-less". So this provides us with no grievance.

> something that has, at best, extremely weak types

You provide the reader with nothing that indicates that strong-typing is important for JSON use-cases.

> schema equivalents that are bolted on, rarely used, and end up relying on humans understanding exactly what the data looks like

There are no schemas in JSON.