In favor of the previous Ediacaran era, perhaps because we know less about it. The only lesson New Scientist types seem able to take from the Cambrian explosion or the Ediacaran precursor is to try to undermine the Cambrian explosion of 539 mya:
This evolutionary starburst is known as the Cambrian explosion. It is one of the most significant moments in life’s history on Earth because it is the point at which species that are clearly related to today’s animals first appeared. It is seen as evolution’s big bang.
But over the past few years, geologists have begun to have second thoughts. Newly discovered fossils and careful analysis of ones found decades ago suggest that animals were thriving in the period before the Cambrian. As a result, some people are now arguing that the explosion of animal life started about 12 million years earlier. Others are questioning whether it is possible to define a distinct explosion at all.
Colin Barras, “The weird creatures that might be the very first complex animals” atNew Scientist
Is that because the Cambrian was Darwin’s Doubt? It won’t really work but one can’t blame them for trying.
The Ediacaran creatures are fascinating predecessors to be sure. They will likely turn out to be explosions of life, just like the Cambrian, but often not clearly related to it.
The Worm That Was Making Those Tracks 551–539 Million Years Ago May Be Found