Could you elaborate on the definition of 'low utility'? Is it only in the context of memorization (retaining), or in the context of general understsnding? Can'

Could you elaborate on the definition of 'low utility'? Is it only in the context of memorization (retaining), or in the context of general understsnding? Can't see how summarizing isn't a preprocessing step for learning in general. Spaced repetition is a natural next step. I don't see how they compete