Opinions wanted: deprecate mglyph from MathML 4 (full) spec?

At the last Math WG meeting, there was some discussion of potentially
deprecating <mglyph/> from MathML full. It is not part of core. For
browser-based implementations, embedding <img/> inside of a leaf element is
an alternative to <mglpyh>.

According to this MDN page
<https://devdoc.net/web/developer.mozilla.org/en-US/docs/Web/MathML/Element/mglyph.html>,
<mglpyh> is not implemented in any browser. I wrote a codepen
<https://codepen.io/nms/pen/GRbwxzR> and verified this is true for Chrome
and Firefox.

If you oppose deprecating <mglpyh>, please reply and state your reasons for
continuing to keep it in the MathML 4 spec.