After reading my article about MN, a correspondent wrote and asked a good question.
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.