Opinions wants: deprecate maction from MathML 4 (full) spec?

At our last meeting, we addressed issue 501
<https://github.com/w3c/mathml/issues/501>: making actiontype optional
matching core. We agreed to move forward on that.

Note: maction in core is only supported to the extent that if grabs the
first child and displays it.

Actions have much more powerful alternatives via javascript in browsers.
With no predefined actions, the question naturally becomes "what's the
point of maction?". Because of this, the Math WG is soliciting opinions as
to whether it should be deprecated in the MathML 4 Full Spec or should be
kept.

If you feel strongly about keeping or removing <maction> please reply with
your rationale.