Lo que pasa al rediseñar un sitio web

How We Lost 47% of Our Users After a Redesign explica:

By trying to make the service simple and minimalistic we complicated user’s experiences. Getting rid of a few tiny details dissolved the whole sense of a queue and availability was lost, leading to a bunch of unanswered questions and reduced usage.
But it’s not the end! We gained a great experience and are determined to make things better now, and more important, we know how.