The simplest argument is that the default is usually... defaulted to. And the default is the redesign -- you have to actively go out of your way to revert to the old design; so the simplest takeaway is that the general public greatly prefers doing nothing, than reverting the redesign.

Doing nothing may be for the reason that they prefer the redesign, but also numerous other reasons apply (including that they don't dislike it enough, or some key new feature, etc).