Conversation

Of course, it's important to note that the broad term "learning" here is used to refer to "accuracy." Trading off accuracy for not-being-bored may actually be net positive for learning writ large! … though, given the reported behavior, it's not clear that's what was happening.
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I think that dropping being good/bad depends a lot on the reasons behind it: "I lost interest in the topic" vs "I find the topic too hard". The real problem is that you need quite a lot of sr experience to tell the reasons apart.
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I think you’re right that it matters why you’re dropping. If it’s out of a misplaced sense that you already know the material, that’s best indicated through something like Anki’s “easy” button. If it’s because you’re bored, that’s another story (& not reflected by these studies)