I just said that because often Elaine Gould is used as kind of a bible
and as normative reference, whereas a notable part of her statements
are personal suggestions and a matter of style or preference. She’s
just the only one who has made a comprehensive publication on the
topic (with Stone and Gardner/Read already being more specific, IIUC),
but the opinions of the master engravers of (chiefly, amongst others)
Peters and Breitkopf of the ‘golden age’ of hand-engraving music are
at least equally valuable.