The only real motivation for holding to MN is to keep the bad guys at bay, as an all-purpose "Press Button in Case of Emergency" defeater for ideas like intelligent design.
What matters is whether any of these theories can explain what needs to be explained: the origin of novel animal body plans and the biological information necessary to produce them.
If real, design is a datum of nature, like it or not. Bad philosophies of science, like materialism, need to get out of the way.
Marks is an evolutionary biologist/anthropologist at the University of North Carolina, and an uncommonly plain speaker and writer.
Thanks to P.Z. Myers’s annual lampoon of me, I’ve thought more deeply about the relationship between development and evolution than I ever expected to do.