"Focusing" of learning is desirable, and could be implemented as a separate memory system for every goal. Cross-exclusion mechanisms might provide this separation, even if a common memory system is used. But this will lead to control problems too. Why? "Because each separate specialist is much too small and specialized to understand how the others work, the best each can do is learn to exploit what the others can do, without understanding how they do it.
(Q: What does this material have to do with the section title?)
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