Halacha has always been "updated" by a system that has been around since the Revelation of Sinai. The issue is whether it is Historical or Revelation. What Moses recieved at Sinai wa passed on "as is" with a text and and explanations. Conservative and Reform movements differ in that it "changed" as a result of historical exigencies. The trouble with that point of view is that many of what they call changes are not often based on interpretations rooted in Gnositic traditions that are also have their roots at Sinai. By their nature Gnostics are a usually harder to grasp for most laymen, so some rabbis, prefer to defer those explanations for people who are better versed in the Sources. In practice, the two extra-Halachic movements veer away from the Gnositcs because it's too mystical, too speculative--it requires Beleiving, which most "modern" people find harder to manage--its easier to be scientfic. Once you put "Sohd" on a shelf, you can make Judaism do anything you please. I fear, though, as always, there will also be four components in Judaism Explanation-Elucidation-Homiiletics- and, "Sohd". Without Sohd, all the other four components will not work!
from the article: How dare Rabbi Amar call Conservative and Reform Jews corrupt?