Why bother taking them?
I've seen people with decades of neuroICU and neuroanesthesia experience, and neuroCCM certification, being screwed over when the neurosurgeons decided that they only wanted neurologists and neurosurgeons in their neuroICU.
NeuroCCM should not have a separate board certification for board-certified generalist intensivists, just for those coming through the neuroCCM fellowship pathway. Every neuro patient deserves a good neurologist/neurosurgeon and a good intensivist, meaning two specialists. Same in the cardiac units, where I've seen some royal F ups when cardiologists/cardiac surgeons play critical care.