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The initial benefit I saw was that you could use a CVT or electric motor to drive the supercharger and then be able to control engine output in a very simple and possibly responsive way. However having an electric motor controlling it is going to be complicated anyways, and a CVT probably doesn't change ratios quickly enough to have any sort of acceptable response.
The most efficient way to try to get energy back from the intake would be with an actual turbine, not a compressor run backwards, but at ~70% max efficiency + friction losses + varying performance across rev range it's hard to justify the cost.
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