BMG: To answer your second point first. We do what the Shulchan Rules, which is to those that can understand a sugya themselves should follow what they understand. (See Y”D 242). [As is quite common, your mixing up a hashkafa question with a halachic one]
R’ Eliyashiv was refering to people as yourself that have never gone through the sugya, as ybl”c R’ Chaim told R’ Karp, a talmud muvhak from R’ Eliyashiv, that since he learnt the sugya and feels it is the correct techlis he IS mechuyav to wear it, even though his Rebbe held not to/
Furthemore R’ Eliyashiv himself states that he never went through the metziyos of the Murex. [See in the letter to R’ Feivel Cohen, and as R’ Karp his talmud muvakh says clearly in regards to the letter].