As for your comment on Conservative conversions, I am in some puzzlement. I never wrote that the Conservative movement has the right to unilaterally change the definition of who a Jew is. You seem to have misunderstood my argument. The first is that it is clearly consistent with Reform principles. If Reform Judaism espouses gender equality, it cannot pick and choose which forms of sex discrimination it will put up with and which it will not.
Matrilineal descent is a form of sex discrimination.
Rather, its own paper on the subject explicitly stated that it did so because so many Reform Jews were intermarrying. Every nation or people in the world has always had their own rules for who is, and hwo is not, automatically a member. It made a few non-binding suggestions. But for some of us, the Jewish community is worth saving and keeping whole. One becomes a member of the Jewish people through a formal process, just as one becomes an American citizen through a formal process.