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The first sentence is just plain wrong. But the implied question, when fixed up, is a good one: what are the opportunity costs for SR? I've experimented intensively with this question in mind. AFAICT, SR is most useful when learning a little outside your expertise.
I speculate most such articles fall into two buckets: (1) by people fascinated by the idea, for whom the opportunity cost doesn't much matter; & (2) by people using it as an important part of their work, who gradually learn to adjust their card-writing so it's on net worth it.
I know I goofed a lot early on with bad cards. And I still do occasionally. But my judgement is that I've gotten far better.
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