It seems that you are saying that somehow Judaism and its Halacha came into being more or less fully formed for all time, somehow independent of historical events and associations with other peoples. Maybe I am just being obtuse, but my reading of Jewish history is that it is a history so full of innovative responses to changing conditions, contacts with other peoples, and the ever-developing understanding of how the world works that it is simply stunning, not to mention beautiful, in spite of the conflicts, sometimes violent, which arose before the innovations became normative. Attentive consideration, however, has been very much a part of our heritage. To debate is not to redefine. To debate is not to convince.
Debate is to learn.
Just like the debate you and I are having. Especially if you take this to mean that we can change whatever we wish whenever we wish. There are other traditions who claim that they are the only path to G-d, for everyone. There are traditions which strongly discourage any questioning of positions established by the authorities. It does mean that change is not an anathema.