And the star k has never weighed in on it. They say:
“While leniencies exist to allow the coffee in spite of the clean-up issues, Rabbi Moshe Heinemann, shlita, Rabbinic Administrator of the Star-K, has decided against using them.”
That’s about the same as saying, “while tomatoes are muttar, Rabbi Heinemann does not like eating them.” If they wish to impose chumras over what is mandated by halacha, they ought to explicate what the parameters of that chumra is, and why. Then we can all ask our rav.
I don’t see why the kashrus orgs think it is their jurisdiction to be setting chumrah policy for all of us. Let us each ask our own rav. Their jurisdiction is their expertise in food production.