The whole success of Apple vs Nokia was UI/UX.
but never forget: tau will be self defining and self amending. everything will be changeable over time. we will have what we'll call "teams" (like "groups" on facebook), and one team will be called "tau" or "root", and whenever there's a post under consensus there, the system will (almost) automatically reorganize itself to admit the new requirement.
this in full, only on the final tau, not on the alphas.
however, computer-assisted collaborative design of tau (or any other project who wants to use it) will begin from the first alpha.
(again i shortened something that deserves a lot more explanation)