It will never do for messianic congregations to simply imitate “authentic” Judaism(s). To maintain integrity with Hashem’s commission, let alone gain legitimacy -or at least validity- in the eyes of other Jewish communities, genuine understanding of the reasons for decisions on practice and the ability to articulate that understanding need to be prevalent among the movement’s members. The school of Hillel could articulate Shammai’s position, and could explain why they went with a different ruling.
Erica, commenter on "What's the Point?" at Drschiffman's Blog.