From: Tom Lane
It's probably mostly historical accident :-(.  There have been
before to convert more system catalog columns to regfoo types, but
serious stumbling blocks in the way:

Thank you so much for concise detailed explanation of the history and
current situation.  I understood that it would do more harm than good
to change existing plain oid columns to reg* types for various
clients, and it wouldn't very beneficial but also not so harmful to
make new catalogs/columns reg* types.


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