To explain away the Cambrian explosion has been and remains a high priority for Darwinists.
The dominant pattern in the fossil record is explosions of new biological forms. The Cambrian explosion is a prime example.
In short, the sequences performed no new function, so no new information was created.
I consider this simple argument as a final nail in the coffin of Darwinian unguided evolution.
Paleontologist Günter Bechly was a proponent of Darwinism until he discovered significant scientific reasons to doubt the evolutionary story.