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> Where each one of those "parse" and "serialise" steps is unique and special, inflexible, and poorly documented.

This can also be a security concern. According to research, a great number of defects with security implications occur at the input handling layers:

Famously, "avoid parsing" was one of the qmail security principles (q.v.).

The maintainer apparently has no transport security concerns. It takes literally two minutes to set up TLS these days