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The big advantage of the auto is not so much the faster shifts. It is the fact that even while the gearbox is shifting the torque converter is still accelerating the car. The throttle never closes and the turbos never slow down. With turbo engines so much more than na, you want to keep the turbo spinning at full flow all the time. If they slow down it takes time to spool them up. The best way to slow them down is to close the throttle which shuts down the exhaust flow driving them and creates a huge restriction to the cold side outlet which slows then really quickly. BOVs help but not much. It typically takes about half a second to get back to full boost after the throttle is lifted for he change even with a fast change. This is half a second the auto is still accelerating when the manual is not..... Times 3 for each change.
Flat shift comes a long way to addressing this. The throttle does not close but ignition is cut. The result is that the exhaust flow is not reduced as much as air is still going through the engine and ther is no restriction on the cold side. BOV does not open. Does not slow turbo as rapidly and when the ignition is returned you hit full boost much quicker as turbo is spinning much quicker. Still not as good as auto, but if you do a quick change it is close.
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