There is a tendency to equate self-organizing complexity with self-replication. As a metaphor, if the cells were only self-replicating, a fetus would look like a tumor.
Also, the emphasis in self-organizing complexity is on the "self". A snowflake, for instance, is not an example of self-organizing complexity because it is made structurally complex by external forces. For more: Syntactic Autonomy: Or Why There is no Autonomy Without Symbols and how Self-Organizing Systems Might Evolve Them
What external forces? And please don't change the meaning of the word force - the accepted definition is perfectly fine.