Not preferable, but preferred. Fit individuals persist to reproduce. Unfit ones don't.
There is no "fitness," as Darwin called it, without conditions and elements that make biological motion take place toward increasing order, rather than decreasing order.
You are just plain wrong here. There is no implied direction of fitness towards increasing order.
Thank fitness that the earth's wobble on its axis found a nice place to persist.
"You are just plain wrong here. There is no implied direction of fitness towards increasing order."
SJ Gould used to dislike the idea that evolution was a process of increasing order or complexity. After all a trilobite was highly evolved and fit its environment so well that it was one of the longest lived critters. People who are anthrocentric think all this happened so that man could emerge, but Gould said that the emergence of mammals and Man was not a foregone conclusion. Chance could have lead away from the mammalian line and today's Freepers could well have been colonial plants.