Are you saying working abs is more taxing on the CNS than working any other muscle group, or just pointing out the fact that it's taxing, iike working any other muscle?
i always work my abs, cutting or bulking. Why only work them when you cut? It's not like you'll acheive spot reduction that way. Work them while you're anabolic so they'll grow, and they'll show faster when you cut. Not to mention your physique will be more balanced; I don't see any reason to leave any muscle group lagging.