Efficiency is only one of many goals we can have; it’s not the only goal, even if some people have a fetish or obsession with it. For instance, right away, efficiency is biased toward things that can be easily measured, i.e., activities and outcomes that can be turned into metrics to optimize. But not everything important is easily quantifiable, such as subjective features.
In education, efficiency often prioritizes outputs—grades, test scores, word counts—while undervaluing subtler aspects of learning like curiosity, creativity, or ethical reflection. Lin is warning, that not everything of value such as the joy of learning fits into measurable categories.