It's just another case and depends on the context you want for the inner code.
Not really. 
   "@{[ ... list context ... ]}";

[download]
That's what everyone expects. But: 
   "${\(... list context ... )}";

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The reference operator (\) provides list context to its arguments. I've been bitten by this in the past as well.

In reply to Re^4: Interpolation requires a spurious variable. Why? by JavaFan
in thread Interpolation requires a spurious variable. Why? by bradcan

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