And while the RFC Editor could (and I assume does) enlist volunteers
to assist it in such review, this amounts to an approval process for
IETF publications that isn't accountable to the IETF community, not
even with a noncom-like mechanism.
Of course, even in the current de facto system of IESG review, the RFC
Editor has the ability (under the current written "rules") to ignore
the IESG even if it recommends against publication and publish anyway.
As far as I know, we've never come to that particular "constitutional
crisis".
IIRC it happened at least twice while I was on IESG.