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I should note that there are (probably broadly trainable) strategies for massively improved rote memorization, but the very hacky way this works makes me very skeptical that information stored this way can be accessed for much more than basic call-and-response
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.
Inside one's field or fields of expertise, SR is still occasionally useful, with little niggling things you keep having to look up. But for the most part I agree: one's natural interest and ways of encoding knowledge are powerful signals which do most of the trick.
(Caveat: within one's field there are genuinely valuable ways of using SRS: http://cognitivemedium.com/srs-mathematics But that piece is principally about a very useful method of analysis; the use of SRS is subsidiary, & has some problems associated to opportunity cost, as discussed at the end.)
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.
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