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Sometimes my sprints come back to haunt my in my dreams, so bad is the lag.
If you're sprinting on 53/11, 10° at the freehub is 2° at the crank. Since the only reason to freewheel in the last km is to get around a corner, with the cranks vertical, any lag is going to happen during a crank phase where you'd be applying very little power anyway. It might even be good to have more lag, so that you can get your crank into a high torque position without resistance :-)
My bullshit detector had absolutely zero lag when I started reading this
https://www.kickstarter.com/projects/2096335262/zhero-rear-bicycle-hub-zero-lag
From the description, it seems that they want AU$155,000 to start making Shimano Silent Clutch freehubs