“It is quite outrageous to suggest that we cannot fulfill a mitzva d’oraisa because we don’t have a mesorah as to the exact identity of the chilazon.”
I think it is quite outrageous to suggest that you understand the place and scope of mesorah in Judaism better than the Gedolei Rosh Hayeshivos. Mesorah is a very deep, profound and nearly impossible to understand even for such great men — for us, we have no relevant opinion nor are we entitled to one amidst our gaping deficiencies in Daas Torah (& Daas stam).